Agreed. But ultimately many issues arise when user agents customize these elements in very dubious ways. It's ok for the most part, but there's a reason behind

Agreed. But ultimately many issues arise when user agents customize these elements in very dubious ways. It's ok for the most part, but there's a reason behind reset.css files, and I wager a more nuclear approach was used here to circumvent these issues completely. I'm just trying to reason on their decision here.