Xbox X or Xbox S? I assume that the 500€ Xbox X can compete with a 750€ PC like I have. That is ~40fps in MSFS 2020
By the way the Microsoft MS-Windows OS is a real CPU hog compared to Linux. I don’t know how “small and fast” the Xbox OS is. But if it has Linux speed, alone from this fact the Xbox can compensate 20% less CPU speed in my opinion.
I can’t say anything about the Xbox S.