I think this is living in fantasy land. Normal people aren't hyper concerned about boot loaders, sideloading or custom ROM's. There was an uptick many years past simply because this offered new functionality, but anymore there really isn't any reason to outside of small things like removing the Google Search bar from the home screen. But the amount of effort versus the result does not balance out.

Normal people just want to buy a phone and use it and they can do that today. They don't want the added complications. There is a reason Amazon is so popular and massive. The goal should be to add simplicity and not add complexity if want something to be popular.