MSFS is very stable in general, i really dont see the point to go as far as a separate windows install.
I have tons of payware 3rd party airports all installed at the same time, flying the crj, have vpilot running for vatsim, have spad.next running for my panels and external hardware, i have navigraph reacker running to have my position on the charts on the i pad, theres monitoring software running (HWINFO/RTSS), Ghub, pushback helper, SimToolkitPro, etc…
Never had an issue or crash, and my sim runs smoth as silk.
Compared to all the random crashes i had with all the P3D version, MSFS is absolutely stable and reliable in every situation. Really, i had no single crash in all my flights.
And all that with a highly overclocked cpu and gpu.
Having a clean and stable system and atleast a basic knowledge why some issues can occur and how to avoid or troubleshoot them is necessary. And exactly that is what 90% of the users with CTDs and other problems are lacking.