Bought it, tried it, don't really like it because:
1. The controls are moved around, and old muscle memory is unhappy when using it.
2. They use a lot of battery power because to just look through them to spot subjects they have to be on, and they don't have or don't like carrying around batteries.
3. They found that aside from being mirrorless and a bit smaller and lighter, the pictures are not spectacularly better than their DSLR bodies, so not really worth it to them to relearn the controls and stock up on batteries.
4. Furthermore, they need to buy new lenses because using them with the old lenses + adapter wipes out most of the smaller/lighter thing. And those new lenses are $$$$.

I have 1 full frame DSLR (5Div), 3 crop sensor DSLRs (7Dii, 80D, 90D) with a pile of EF/EF-s lenses and an R7 with 1 RF lens and one RF-s lenses plus adapter and 1.4x extender. I am making the effort to learn the new camera, but actually my new Sony RX10iv is getting a lot of my time as it is so handy to take just-in-case. If I plan on a trip to do the birds at the Riverwalk then I will haul out the R7 with 100-400 + extender or the DSLR of choice with the Tamron 150-600 G2 and extenders. And at 77 last month, I may consider hiring a lineman from the high school team to act as "gun bearer". A couple of bucks, a stop at the fast food joint and maybe some free photography lessons (I taught basic photography a bit on the side when I was still teaching history, geography and government.) and maybe the loan of a camera now and then should get me a good strong one fairly cheap. Besides, he can double as my bodyguard to prevent some #$@&% from mugging me for my wallet and that expensive photo gear.

It's 4th of July! If you are from Bradley Beach, NJ (as I am), you ate hot dogs at least once a week, probably more, in the summertime. Down on Ocean Ave., there were two places to buy a hot dog. One was, Mike & Lou's - the first one. There, one could get a perfectly cooked hot dog (with spilts) from grilling when it was done. Mike & Lou's used Schickhaus hot dogs and put it on a slightly toasted hot dog roll. Mustard, sauerkraut, hot or sweet relish were in "self help' vessels. I think it was $.25. Mike & Lou's opened on Memorial Day. You can bet I had one on Memorial Day and many days after as the summer progressed.

In the early 50's, a new hot dog place opened. The owner was a man named "Syd" who had a famous hot dog stand in the Weequahic, section of Newark, NJ. Now Syd only had kosher hotdogs (probably Hebrew National or Reinfeld) and he boiled them to perfection. He decided to open a 2nd stand in Bradley Beach and of course named it Syd's. If one wanted a hot dog with "stuff on it", you ordered it sweet, hot, mustard only, mustard-kraut, sweet works or hot works. Only Syd could put on the "stuff".
So, as a teenager, one hung out at Mike & Lou's or Syd's, depending on how you liked your hotdog. It was very ritualistic with loyalty to one or the other. And just as the constant argument of which is better, Canon or Nikon cameras, the argument went on all summer of which hot dog was better.
So, my wife & I are having a Mike & Lou's hot dog this evening for super. Yummy!! Can't wait!! Yup, I griddle them, have sauerkraut, relish and rolls all ready. Hurray dinner!