Unless you play a lot of multiplayer games, you don't particularly need a 200+Hz monitor. That said, get it if you want, because one thing I don't do when buying machine parts/building PCs is listen to the typical 'you shouldn'ts'...
"you'll never use that much RAM"
"you'll never be able to see 144Hz and beyond"
What I WOULD avoid? Chasing the HDR dream. Right now, it's pretty iffy on PC. The sweet spot is 1440p/144Hz/GSYNC or Freesync unless you really, really want that 4K (which I'd understand as an owner of monitors running both resolutions). Also, if you aren't in a really big room, a 27" is also ideal. Not to big too sit in front of and not too small to make out the more minute details.