I would have preferred tabs to win for this reason.

Unfortunately, as you pointed out, "good enough" can be excluding, non-inclusive. Overall it works well enough for enough people / none with impairment stumbled over it yet, did not voice or were not heard.

the majority of healthy people has no problem marginalizing minorities with disabilities

I wouldn't attribute malice like this though. Most people just don't care or are not mindful and thorough.