To explain FSR and the rumor 100 turns it off
No it doesn't. FSR is on regardless if it's at 100, 99, 90 or 0. The game does not run natively and there's no way to turn off either upscaling options at all. People keep saying that the 100 turns it off. I tested it in multiple locations throughout the game by going first person. I did two tests for each area, a standing test and a movement test by pressing Q and E. The dead giveaway was always the same. The blurring from the upscaling affects the trees, vegetation and grass in most instances. These were in open areas like La Noscea, Thanalan, The Black Shroud, and many others. I even tested it in areas like Limsa to see if it was a high frame rate thing with the game's engine. I found that FSR is always on regardless of what settings you have. It's really baffling to me that they made the decision to force upscaling on.