There is no such thing as a "raw" image! Any image you see is derived from processed raw data.

Using a television (old or new) is the worst possible option for a monitor used for post-processing if you want your prints or images posted on social media to match what you see on the screen. If you want good quality output, consider a monitor designed for processing images such as is available from BenQ. Here is a link to one of their least expensive monitors for photographers. Be sure to check out the reviews by scrolling down the page. https://www.benq.com/en-us/monitor/photographer/sw240/reviews.html#expert

A hardware calibration capability is much more important than resolution. Most pros are using 4K monitors or even monitors with less resolution.

I would call BenQ. They were very responsive in helping me solve a problem over the phone.

The necessary quality of the tripod and head is a function of camera+lens weight, maximum lens focal length, and the environment in which the photographs will be taken (ground vibration, sustained wind, wind gusts). Wind can cause vibrations, especially on long lenses.) The length of the tripod legs is important and depends, not only on the photographer's height, but also on the area in which photography will take place (if you will be photographing on steep slopes, you want longer legs that can be extended on the down-hill side. Center column extensions are problematic except in vibration-free circumstances.

I use a BenQ monitor. They can be hardware calibrated, which is important if you want to print. Inexpensive monitors that do not support hardware calibration are a big problem if you want your print to match what you see on your screen.

Although the Apple MacBook Retina displays cannot be hardware calibrated, they can be calibrated and are pretty accurate.

The A9 uses a contrast detection focus system. Olympus uses a phase detect focus system which is faster. Thomas Stirr doesn’t have much difficulty capturing great bird photos using Olympus gear. He handles noise in post. Check out his web site: https://smallsensorphotography.com/

I would get the D500, an L-bracket, a set of ND and polarizers with step-up/down rings as required, and a good tripod and head.

I use an iPhone app (SetMyCameraMx) to calculate depth of field and hyperlocal point. It also calculates the reverse depth of field: When you enter the near and far focus distances, it tells you your optimal distance from the subject and a) If you enter your f-stop, you get your lens focal length; or b) If you enter your lens focal length, you get your optimal f-stop.

If you want a laptop, consider the MacBook Air. I've used it for Lightroom and Photoshop. It runs them nearly as fast as the new MacBook Pro computers that can cost 2 to 4 time as much. PCs cost less, but Macs are worth the extra cost. My wife had so many problems maintaining her Windows PC that she finally gave up and switched to a MacBook Air. My daughter has had four windows laptops over the years for school and work. None lasted more than two years before the hinge broke, the screen delaminated or the trackpad failed. She used my MacBook Air when her latest PC laptop broke down and had to be sent off for repair (four week turnaround). When her PC laptop was returned, she gave it away and kept the MacBook Air. That was five years ago and she has had no problems since. Macs tend to be trouble free. You can get MacBook Air with 16GB of RAM and 512GB SSD for $1,449 before tax, but I would recommend the upgrade to 1TB SSD. Macs have very fast SSD access so even 8GB of RAM works, but if you go that route, I would recommend 1TB of RAM for the same $1,449 price. If you have an iPhone and/or iPad, the integration of all Apple products is fantastic.

If you have a keyboard, screen, and mouse, the Mac Mini with more ports than the MacBook Air is a great option with 16GB RAM and 1TB SSD for $1,299.

Are you converting to 16-bit or 8-bit TIFF?

Thanks for the comparison. I also use FastRawViewer to cull my photos.

I currently rename my files in Lightroom. Fast Raw Viewer has a File Rename option in a Beta version. When it is released, I will rename my files in Fast Raw Viewer and copy them to my external PhotosBackup drive before adding the 1-star files to my Lr catalog.]

The best option for Lightroom CC, Photoshop, and plugins is an M1 MacBook Pro with 32GB of RAM, 1TB SSD, and an external hard drive or SSD. Lightroom and Photoshop are memory hogs and anything less than 32GB RAM will cause continuous swapping to the internal SSD, slowing things down.

I ran Greg Benz’s Photoshop benchmark on three computers:
2014 iMac Desktop; 4 GHz Quad-core Intel i7 processor; 32 GB RAM; 4GB Radon R9 Graphics Processor: 204 sec
2020 M1 MacBook Air; 8 Core CPU (4 performance; 4 high efficiency); 8 core GPU; 16GB RAM; 1TB SSD with ~60GB/sec memory bandwidth: 132 sec
2021 M1 MacBook Pro Max; 10 Core CPU (8 performance; 2 high efficiency); 32 Core GPU; 64GB RAM; 4TB SSD with 400GB/sec memory bandwidth: 60 sec

The best comparisons of M1 MacBooks that I have seen is: https://www.youtube.com/watch?v=-ZLriHDpemA

Good luck.

Camera manufacturers make money on high-priced gear. They make close to $0 on low priced gear. Entry of Nikon and Canon into mirrorless, and the imperative that they meet or surpass Sony (which had a seven year head start) has been extremely expensive. And the chips and optics they need are pushing the limits of what is currently possible. That isn't cheap. Also, people seem to be able to pay for the high end gear and willing to wait months to get it. The capabilities of today's high-end cameras and lenses was unimaginable just a few years ago. Lens focusing motor systems of five years ago are not capable of supporting 30fps shutter speeds, and lens resolution that is just sufficient for 24 and 36 megapixel sensors aren't adequate for 50, 60, and 100 megapixel sensors. So in addition to developing new cameras, new lenses--better in every respect--had to be developed. $$$$$ The price of today's camera's will drop when tomorrow's camera's go on sale; but lens prices won't drop as much.