It seems everyone prefers a different colouring to their syntax highlighting, which you get used to, and other peoples' looks weird! But code should look like what you personally want it to, surely. There's no one way. Sure, you could write a manifesto promoting your opinion to a prescription for everyone, but why? You don't have to look at theirs, they don't have to look at yours. Yes, maybe for code sharing, low- or no-colour is more like a common denominator, and not strange/disorienting for anyone.

I find one of the main benefits of syntax highlighting is it's less tiring on the eyes. And once you get used to it what your colours mean, much faster to read. Having it look attractive as well is just a side-benefit, though not a small one, if you spend a lot of your life looking at code!