And there's threads a plenty about people messing up their partitions, user accounts, email settings etc. Should we not let people access those areas of the system or apps?
It is literally impossible to completely inactivate your 3rd party monitor with Apple's standard display settings, unless there is something seriously wrong with that monitor.
BTW, since you brought this up, Apple now hides certain partitions and directories from average users for this reason. There are ways to access them, but not the usual methods on first glance. For example, the Library directory in the user accounts is now invisible. It wasn't when I started using macOS, but Apple hid it I suspect because people futzed around with it too much and screwed up their installs.
If you do want to go futz around there, then fine, but obviously I don't recommend average users do this just for fun. If they need to then they need to, but if they don't need to, why bother?
Again, just because there could be a risk if you're not careful doesn't mean you shouldn't use it.
Again, I said there is not anything wrong with installing it if you want to, but my point is that it is not necessary for most people. Install it if you want more flexibility, but if you don't actually need it then don't bother.
Not strange at all, its great tool that most people who don't use an apple branded display will benefit from, pure and simple.
There are a ton of great tools out there, but I don't recommend all users install all of them, because not everyone needs all of them. BetterDisplay is indeed a great tool, but not everyone needs it, and it's a tool that does carry more risk than some other applications.