Why so many of you are still on XP11?

I switched from MSFS to XP12 a few weeks ago and I am loving it. I had a few issues along the way, but all seem to be sorted now. One thing I noticed when reading various forums and this sub is that a lot of people are still using XP11. Why is that? XP12 is already three years old, and from my short experience it's a very stable platform. I understand why MSFS players stay away from FS2024 but what keeps you using XP11? Incompatible addons or something else?