https://www.avbend.com/blog/how-to-calculate-tv-size-and-viewing-distance/
Recommendation for a great immersion (cinematic movies and of course videogames) is 40 degrees FOV.
Sitting 20 feet away from a 65‘‘ TV are 15 degrees FOV resulting in a very shitty immersion.
I also wonder how do you read the text of a game in that distance.