yep, that’s the difference between other games and a sim. In a sim the CPU has to do a LOT of work for each frame (aerodynamics, weather, AI traffic etc etc). For a shooter there is much less involved, and the CPU can just crank out more frames for the GPU to process.
So yes, get a 4K or (ultra) wide 1440p screen and you’ll get the same frame rate with much better visuals in MSFS.
Running shooters at higher resolution will of course eat into your FPS
They’re just different sorts of programs, that run in different ways.