I can understand the design, in some aspects (navigation), for ADA. The only color issues I could see would be color blindness. My dad is red and green color blind. I've never heard of this being an issue or any issues he's had with sites. Now, as with anything, certain colors might contrast weird to him and make things harder to see or read; but, in general there are easy fixes in the very rare circumstance he has an issue (switch to black and white graphics, night/dark mode, or vice versa). Keep me posted though with what you hear on this. I, along with others, would definitely be interested in hearing about any color thing. ♂️ I'll be doing some research into that aspect as well, now.