Like I always say: the most consistent thing about MSFS is how inconsistent the experience is from user to user. You can get 2 people with the exact same hardware (like an Xbox for example). One is having no issues, great frame rates, and having a blast. The other is having a low frame rate crash and stutter-fest every time they load in.
Sadly, it’s a reality in all complex software. There will be gremlins. And they’re not always easy to find. Unless 100% of people can reproduce it 100% of the time, there’s no guarantee that devs will be able to find it. Particularly if they can’t reproduce it.