When I was healing Mentor Roulette a lot for weeks, I was using it effectively on a very regular basis. There are a lot of common scenarios where sprouts die and you know what they are if you've done 10k dungeons, and there are just so many scenarios where I was able to save them with it. It convinced me that, yes, it is useful when used appropriately, it's just that obviously it can be misused regularly by certain types of players.

I would say that, scenarios where someone has misused it on me are extraordinarily rare. It's not common enough to where I am annoyed by it. I have had a few times where a healer was pressing buttons by accident and used it on me or others because it was next to another button, but usually they aren't moving a tank considering they can eat mechanics and there's a pretty good chance that they'll pull a tank buster onto themselves, or some other kind of defamation that ruins the pull.

Context is really important. Obviously it makes more sense to rescue a Returner/Sprout than a Mentor. You can observe if they know what they are doing, if they are doing positionals and things like that, or in contrast seem really clumsy and get lots of vulns. Probably not a good idea in High-End content unless coordinated, because there are so many situations where they can beat the snapshot still or use teleport actions like Aetherial Manipulation, gap closers, Sprint, to skip across the arena fast.

I'd be alright with an opt-out from it though.