You are right that you can change i/b using css, but you can’t change accessibility software that relies on them to be tagged properly….
Just because
you haven’t seen it doesn’t mean it’s not out there and used properly. You obviously haven't seen my books (or read the examples I've posted here) then you would have seen them...
Again…these are all arguments that have been presented here before, you just choose to ignore them. That’s fine for your personal books, but please don’t present it here as the way it SHOULD be done.
Edit: take a look at the
daisy accessibility listing for em/i strong/b