I think we're arguing two different points. You're arguing about implementation, AI is great at this given the existing defaults and the right prompting. AI was trained on 30+ years of accessibility standards that a minority of great humans fought to establish as a familiar practice.

I'm arguing about invention. It is extremely unlikely that AI will be the one to invent the next accessibility paradigm, because that requires deviating from the training distribution, which it CAN'T DO.

I'm also arguing that this homogeneity in design will lead to an atrophy in inventive, unique and original thinking.