I use locked camera... maybe I don't show up in your stats at that because I haven't found the option to change that on my side, I just toggle it at the start of the game.
I like to play highly mobile champions, or ones that require constant input. Spamming me some skillshots is much more fun than auto attacks, and even auto attacks sometimes I send each one to a different target at 2.1 attack speed.
On trying the unlocked camera, I found it neither smooth nor precise enough for those times when I need it stationary to watch for enemy champions in lane stepping out of bushes to get into range, when I want to target champions I am chasing, or just laugh maniacally and throw bombs in all the bushes along the way so I can hear them calling out "maphacks" in chat.
Also, with the number of clicks I'm already giving to dodge and weave against skill shots, attack those minions, and precisely aim my own skillshots, I don't have time to wave at the edges of the screen, click the minimap, or depress middle mouse and swing the screen wildly, as my mouse is all tied up in the action.
I can't be holding spacebar for camera locking while doing that either, since I am very attentive and aggressive, and holding spacebar for 10 minutes solid during a game makes my thumb go numb.
I find skillshot ranges easier to judge in locked camera because of the camera angle making the distance across the screen they can travel be different by how far back or how near the camera is.
So I like totally learned how to land Caitlyn glaives and Ashe arrows by glancing at the minimap, and just firing off the corrected degrees. Artillery Skillz, Yo!
As for my LoL mentor who uses unlocked camera... well, I don't see it helping much, really, as they tunnel vision to their target, and run off without seeing the ambushes going off behind them and the rest of their team being killed as they plan to tank a tower for us or something. Or watch a fight, or their own Ashe arrow, and get walked up to and smacked by the enemy while paying attention to another person's lane.
Now to tackle the list of proposed solutions...
Flipping the camera for purple team:
Argument Against: Flips all important position of Barron Nasher and Dragon.
My rebuttal to the argument: Unflips jungle. It's more important to me when I play an AD carry to grab the small golem camp before minion waves meet to be the first to level 2, than it is for me to worry about someone trying to solo dragon the moment it spawns. If I have lane supperiority by that point, I can temp mid while mr AP and Jungler and Bruiser tackle any attempted dragoning.
Argument Against: Well, it does make front attacks and laning easier, but it makes purple teams have more trouble circling around behind towers to get into position for teamfights.
My rebuttal: Wha?
Expanded: What do I care?
Expandeder: How often does this come into play for my entire team even if I'm winding through the jungle to pick off retreating champions.
Expandederest: Why the hell am I zigzagging through the jungle with a slow AD carry with massively long skillshots when I could be attacking from the front where it is both safer, and I can get to in time even iff my team is circling.
Argument Against: Causes people communication not able to tell which way is top or bottem.
My rebuttal: Why are you communicating with blue team, the only people who aren't flipped as well?
Make spacebar disable camera lock on hold for locked players like it enables camera lock on hold for unlocked players.
Argument Against: Play unlocked NOOB
Rebuttal: *close thread*
Argument Against: Press Y, NOOB!
Rebuttal: Already do, but holding and toggling are apparnatly different enough you don't do it yourself, and it seems a very easy change.
Argument Against: Not as easy as holding spacebar the whole time!
Rebuttal: Hold spacebar for 40 minutes, say it was easy, and I'll never argue with you again.
Change Camera angle closer to straight down on the map.
Argument Against: You wouldn't be able to tell champions appart.
Rebuttal: I'm pretty sure Chogoth's back is different from TF's hat.
Argument Against: You wouldnt be able to stare at Sivir's legs while she runs.
Rebuttal: I'll take overhead of her rack anyday anyways.
But really, that's a joke entry.
Argument Against: Your field of view has been precisely calculated and this would affect game balance.
Rebuttal: Yeah right. Rather than play full screen at 16:10 resolution, I play windowed at 16:9, and can see 2 tank minions farther on either side. This has affected my combat, and the directions I pick to gank from. I really don't think you care that much.