I don’t think it's actually a net benefit. Adding the wrong value degrades the experience. I've seen links marked with `role=button` for no reason and generall

I don’t think it's actually a net benefit. Adding the wrong value degrades the experience. I've seen links marked with `role=button` for no reason and generally roles added when one is implied (role=link is implied on anchors for example). If aria attributes are treated as "private/testing API", then one wouldn't be surprised when the value only makes sense to bots and not humans.