I believe FF7 Remake does not have it last I checkedI think Fallout 4 was the last game I played which had an issue with ultrawide. If it was 5 years ago then your concerns would be valid, but these days it seems to be very rare that there is no support.
That being said, the 38" Alienware does not have 1:1 pixel mapping for non-native resolutions. It's trivial to enable it in the AMD driver, and something I rarely (if ever) use, but still would be nice too have the functionality if needed.