Originally posted by Tolkien
this is like telling a racecar driver why speed limits exist
In that comparison, the speeding would be equivalent to: "people would just use their powers to abuse it".
Having full control doesn't mean abuse...
I see full control as full customisation and using a device to its full capabilities.
Android's equivalent: custom ROM's etc. (aka personalizing your device fully).
As I said, I think it should be fine to have custom firmwares as long as you aren't harming others.