

That isn’t entirely true. You can change it as long as it is done via package overrides or overlays. Sure it rules out just compiling/installing something into your root unless you package it first but you can change it.
I honestly like the fact that it effectively enforces every file in the immutable parts of the OS to be traceable back to some package.
I’ve never used a case and never broken a screen. I’ve only replaced my last several phones due to swollen batteries. Although, I’ve definitely dropped my phone a couple times where I thought for sure that my streak would be over, but I’ve just been lucky.