I'm guessing the new customization options are still work in progress (I couldn't find any widespread announcement mention of it anywhere, other than on Shaun's profile post), so I guess that's why "Disable custom Patron profile page color schemes" doesn't work on the new username styles?
Although if possible, I'd love if the *style* and *profile color* options could be separated, as most people use the profile coloring non-intrusively, so the text stays readable. But the text *style* makes it super hard to read, especially where the font changes. Not so bad for the custom title (as you never *need* to read someone's custom title), but extremely bad for usernames, especially when reading a thread, where who says what matters.