What are you talking about down grade from 36 to 31. Has nothing to do with slow or fast ring. You can pick slow ring in 36 or fast ring in 36. All slow ring is that it has been more tested for the build that's it.
Sorry to hear that you're mentally challenged, I guess that would be a good reason to not know different insider rings serve different purpose.
What is the reason you are not liking this? Why does it bother you what home users do? Do you provide a free PC repair service that takes up all your free time fixing home users Windows 10 installs because they have uninstalled built-in apps? Ever heard of the Windows 10 store?
You are talking b******t. Sure. I'm home user neither u. Also, MS should make their Store built-in, so it shouldn't be uninstallable even through PowerShell.