Yeah, you're right. l was poking around and it's also kinda inconsistent if you're under pressure. That's the who argument over not using it period, though, so...
How about just indirect pressure, like player positioning? l see a lot of back rolls just when the opponent's kinda close, but it looks like there isn't much they can do to attack that can't be reacted to. For example:
https://www.youtube.com/watch?v=FnU0mZD6hk8 at 1:55, Reflex pokes with a dtilt, and Abadango rolls back. In that situation, why wouldn't a PP back work?