Placebos i would say. An image processing chip like Bionz for mobile is much needed in order to convert the cameras raw data and make it for instance a jpeg. This is how it works in all cameras. If that wouldn't be there then the camera wouldn't work at all. That was the case before 4.3 right?
I spoke to a Sony technician saying that "unlocking a bootloader won't change the phone, but custom software will and that might brick your phone" he admitted that they've had problems before 4.3 but that has been solved now. And I had to pull that out of him kinda. I asked alot of questions that people kinda just speculate about because I want hard facts. He wasn't that keen on saying much more but I gave him my email address anyway.
Interprete this how you want, I don't wanna be held responsible for anyone might bricking their phones. Just forwarded what's told to me.
Sent from my C6903 using xda app-developers app
Xperia Z1 - Stock kernel - .761 - Locked Bootloader
Xperia V - New display and working like a charm.