xbox uses AMD gpu so msfs is going to support FSR 2.0 at some point. I ended up buying 6900xt to pair with 5800x3d because was only $100 more than 6800xt and less than rtx 3080 12gb. I don’t have plans to upgrade anytime in the next few years.
I think 5600x and 6800xt would be a great combo and you get the extra VRAM with the amd card which can be improve performance for complex scenery/airports. Good luck!