2070 will work in a lot of games, The more graphically intense games will need their settings dialed down. I’d always go with an i7, should have more cores.
I would think it would depend on the game and the quality setting, but yes, you should be OK. Since you have a 20xx GPU, you should be able to run “fixed foveated rendering”, which should help.
Yeah, again you’d probably have to change some game settings to get it up to 90fps.
Really to me the large FOV is not much different than medium and of course shows more distortion at the edges.