Most people don’t care about that even a little bit. Back in the day I used to use various custom roms on my android devices, it was awesome. But that was then, I have a job and family now and I can’t just reset my phone on a whim because there’s some cool UI tweak in a new rom. Plus, most of the stuff that made custom roms worthwhile has been integrated into the OS nowadays, so the value add is significantly diminished.