Hmmm. While I am against having people who haven't cleared join my PF for farms I can't really say that I would be for this. Mainly because it's easily self enforced without the option. Join ---> See Bonus ----> Leave -----> Kick person and or blacklist. If there was a penalty or limitation to backing out of pre-fromed parties I could understand the need but honestly this is very easily self enforced and I would rather have the devs spend time on more content or more need QOL changes than something like this. I wouldn't be upset if they made the change but I don't really think it's necessary at all.