Colour variations are very useful as anchor points for the brain to quickly assess where it needs to look. I often get lost in the current all-blue UI.

I've spent far too much time working on UIs lately...

I use the Bridge Officer UI with red, blue and yellow. That's nice, out of the way, and useful. We don't need more than that. People choosing not to use that, it's their own fault.

Choosing? What choice?

Normally these things are subjective, but I think UI design has an element of science to it and you're wrong on this. The Human brain is wired to recognise shapes and colours, and to 'navigate' based on learned positioning.

We've been running multivariate tests on our website button colours where I work. It's surprising how often normal people miss key information or progress points just because the button is the same colour as the UI.

They should use and improved version of the nemesis lcars.

Seconded. Though the current UI is very low on the real estate side, it could be a lot better.