Agree with all of it.
Quick points:
Excellent IQ - not even comparable to my 70D. Noise at 2300 on 6D is equivalent to 70D at 800iso !
AF is truly awful for pulling focus (lateral and wing beats are a function of shutter speedsp that is fine). However, will focus decently in low light.
Center AF point only. The other 8 points are useless.
Really reallly good non-sports camera. Again, AF is excellent with the center point ( but will not pull very well).

Having said all that, here is a pick of a hockey player coming towards me and shot yhrough the plexiglass. It is possible to get a sports shot but with slow AF pull and 4.5 FPS.....more tossers than keepers....

(Download)

Ooohhh. Those 2 extras are what i need for my double BR! Would have solved my swinging camera issue AND give me the confidence of the 2nd safety tether. Stood in the middle of a wide stream to get a shot once with about $10k of gear on the double BR and dropping one of them in the water was in the back of my mind)

Thats about right. Counting rehearsal and rehearsal dinner previous night and continuous motion shots ...

It was a PK/MK wedding. Did it for free.
(PK = Pastors kid, Mk = Missionary kid).
They have no money.

I have 4 other paid weddings this year and another Pastor wedding (heavily discounted but they are both employed - met at the church).
2 destination weddings also....watching closely the airlines rules on in cabin equip and batteries....yikes.!

You betcha!
Other than my dear close friends at the Hog, the Bride didnt k ow or care if i took 5000 or just the 800 she received.

Extra shots were mostly exposure tweaks, closed eyes, AF Servo/Continous photos of bride coming down the aisle so I could pick the best neck-leg-foot angle .... mabe someday I csn anticipate with small shutterlag, the exact perfect moment to squeeze off that shot of the bride walking the aisle where it is all perfect...unlikely:-)

I did all the ornaments, macro of rings, bouquets etc also in the day. (Rehearsal and Rehearsal dinner too). I think a 3:1 hit rate is probably my target....

I would say it was less spray and pray and more "tweak and retake" or rapid-fire motion continuous series. ...ever seen a wildlife photographer use one-shot on single drive and nail that perfect wing arc?

I dont make my living from photography so I can afford the time to brood and curate the photos over many weeks....

8am to 11pm. Bride breakfast, hair, makeup etc, groom getting ready. 3 shirt changes(hot day), 2 cameras on body with a tripod running video at ceremony. Portable studio with 4 speedlights on radio triggers for impromptu bridesmaid bedroom photos (omg gorgeous), sunset shots, walk through Kleinberg (old town), limo, photos on ladder of the entire 100 folks who attended the wedding outside the church (before the heavens opened with a cloudburst). Over 100 hrs of post processing work.

Bride wept like a baby when you she saw the final results of the full day...inconsolabley happy... made the day worthwhile :-)

Loonie tunes...wont do that again !

....ok maybe I will....

Forget GAS attacks....I am hooked on the adrenalin, anxiety and uncertainty of weddings....
Would do them free just to get a fix (almost)

Keep all lenses that are reasonable quality for the purpose you intend to use them.

I have sold my 18-135mm, 75-300 70-200F4L , and 50mm 1.8

Other than the 75-300 (which is truly garbage) ....I wish I still had them all. The 70-200 is sooo much lighter for sports and the 50mm1.8 is backup for my 50mm1.4 (which is a tank). The 18-135 is great for video.

Reason: you can use them or give them as a gift to your Grandkids when you step up to full frame camera:-)

At the time, I needed the cash to justify to the home CFO my continuous GAS attacks leading to my current gear. If you can afford it....keep 'em.

Net:
18-135 - soft but good for video and covers a range that the 24-105 wont.
50mm 1.8 - cheap and versatile (other than the 70-200mmF4L perhaps the best value for money of any lens in existence :-)
70-300 Hmmmm.....the extra 100mm may not be enough to justify keeping it....sell it and get a 150-600 (Tamron G2 or SigmaC - both great value for money).
The Samyang is probably too soft. (The 24-105 is decent but also a little soft for making big prints but otherwise really good).

Lots of choices and decisions...so much fun !

I have the double BR strap. Works great.
Only flaw with sling straps in general (especially doubles) is they will "swing" if you are trying to climb or descend. I have seen some DIY solutions to this you may want to research.

If going for a walk, takes a load off your neck and you have instantaneous access to the camera.

There are also some really cheap ones on Amazon. Not sure how reliable they are...

RAW+ jpeg small for windows explorer quick check. I only shoot RAW but am considering going this way for ease of workflow. (Ie quick check and delete both before import to LR). .... I shoot a lot of "deleters". Took over 5000 at a wedding...kept 800....

Excellent advice. No lower than 1/1000, let ISO auto and play with the aperature for DOF. I usually leave it at 2.8 because I love the look. Only point of debate would be using spot focus on the center AF point and crop in post to taste. Center AF point is almost always the fastest and most reliable and in sports shooting...that is what determines getting the action and missing it. I have found multipoint to not work as well when the action is fast and furious.

Also, learn to use Back button focusing and set the autfocus mode to Servo (canon). Shooting mode to high speed continuus.

Hold that back button down, point and fire away ! You will get lots of files to delete and I can gauarantee a couple will have your friends thinking your a pro (just dont tell 'em you shot 300 pics to get that beauty your are showing them :-)

...as you gain experience, your "keeper to tosser" ratio will improve...

Sadly....Canon really bites it in the ISO Invariant dept and Sony and Nikon rock. Closest Canon has to ISO Invariant dept is the new 5DMkIV. Above 400ISO in camera, the pics will be ISO Invariant up to 4-5 stops. Meaning if you set the camera at ISO400, any pic up to what should have been 6400 ISO in camers will be virtually identical to PP in LR or ACR jacking up the exposure slider. All other DSLr cameras from Canon just wont. (1dmkii is close) . ISO invariance in real world shooting means not having to trade off highlights with underexposure. Go ahead and underexpose the image to not blow out the highlights, pull up exposure and crank down the highlight sliders in post and voila !

I have used this extensively since i got mine. (More accurately/honestly, had the wrong settings and got away with it :-)

...love my 5DMkIV....

Confession. Have also done "walkaround" with a double BR strap and 2 bodies, slinging a 24-70 and a 70-200. I look like a complete dork ...but I don't care :-)

Info is there in the OP. Just need to scroll up. If you look at the OP on a smartphone you will only see the pic...

...well that explains the color....:-)