Yeah, the thing to be careful about is how the TVs are for gaming. Probably not as much of a difference for just watching crap. A lot of cheaper 4K stuff are lower quality and will have lower brightness levels and/or high input lag. There's also some sets that claim to be HDR but are actually "HDR compatible" or just shit-quality HDR to the point where it makes no difference.
economies of scale.
Check out the TCL-P line. Excellent prices.
Definitely. The TCL-P605/607 is the best "budget" 4K HDR/Dolby 10 TV that actually works really well for gaming. It's around $600 and is a steal for that price.
The Wirecutter named it the best 4K TV overall because of its price and noted that it beat out TVs that cost 2-3 times as much in tests. That's when I jumped on it and bought one.
https://thewirecutter.com/reviews/best-tv/Also would like to note that while I'm happy with the TV, HDR is overrated as fuck. It's nice, but not "OMG LET ME RUN OUT AND REPLACE MY 1080P TV" nice. I did it to replace a 27" monitor that I had been using for gaming. Wanted to get a bigger screen. Almost returned it when I saw a 40-something inch monitor that got released, but it apparently isn't very good for gaming.