For what it's worth, I toggle my lock. I also obsessively check my minimap and play primarily melee characters. I unlock in order to check on things and so forth.
The problem is, the default option for the game is locked camera.
Anyway, despite me playing both locked and unlocked camera, you'll notice that I'm the first reply to the OP and I'm advocating unlocked camera.
There's nothing wrong with locking your camera, and I do wish you could flip the HUD, but if you're playing with a lock camera, you have no room to complain about any purple side disadvantage, because it's a disadvantage you're giving yourself.