I agree with OP. Yeah, everyone's gonna start a flame war, "hurr unlocked is for skilled players stop being lazy" but it seems like an incredibly simple game mechanic that should be an option.
Riot doesn't even have to switch the screen orientation - all they really need to do is allow the HUD to be flipped, and then both teams have a fair view of the screen.
Flipping the HUD/switching the orientation, whatever, it's not something we complain about because we're lazy, we complain about it because it'd make our lives easier. Unlocked is clunky at best, and even then it's not as if one would play the entire game unlocked. Unlock is used to get a better view for the situations that call for it, but it certainly isn't a viable option for the problem. At least, not as much of a viable option as changing the orientation.