I just replaced my 4790K, 1070, 16 GB RAM with a 5900X, 3080, and 32 GB at 3600. I have everything on ultra and haven’t even looked at my FPS. All I know is that the same runs well for me.
Back in the FSX, X-Plane, P3D days, I would obsess about tweaking to get higher FPS. I stopped doing that with MSFS and enjoy it a lot more!
Plus, after the update coming in a few weeks, we all should see some improvement.