Probably, but they tend to also make for an ugly look, like the “Increase Contrast” setting in iOS. The other way around would be better: Have an accessible down-to-earth default, and a secondary “fancy visuals” mode for those who want that.
Given the huge change and sensitivity to accessibility I'm going to guess the opposite -- it will be designed to look nice without transparency.
It’s simply a matter of “which settings would MOST of our users want enabled by default?”
I do agree that the accessibility settings can make ios pretty ugly though. It’s a real shame. :(