Since I am a lock-on character player, this topic interests me and compels me to give my 2 cents.
The reason mainly that I screen lock on my character is that it is something less to manage, I find myself losing my character in team fights if I am not locked on, I went through 25 levels before seeing the need to *sometimes* have it unlocked, and I run out of space to click farther because what I need to click is on the edge of the screen and I don't have the time (or don't think I do) to move the camera farther to on top of my target.
I don't quite see why zooming out would be a problem, seeing as the fog of war will still limit your vision, and the overall viewable area won't be that much different (if at all) for larger screens with bigger aspect ratios. (I've been reading the Riot posts, and it's kind of stupid imo to say in one post that it most likely won't happen because of the aspect ratios, and then in a different post saying that it isn't your call...)
I also don't see why if it is a known problem that Purple side has a disadvantage (even if you are locked or unlocked overall because of the isometric view that is given that favors a view to the top overall) that they don't work on fixing the UI...
If it would be a problem if you fixed parts of the UI in certain spots, it would be smart to make it so that more of the UI was configurable and movable to the individuals desires.
This is my gripe about LOL, is that there seems to be very little in the way of in game options that is able to be tweaked to what the individual wants. Like moving around the different parts of the UI (even turning them off like the character portrait if wanted)
End Rant/whatever this was :P