I decided to post this under "Other Battle Systems" since this is a general issue with all combat classes rather than just a specific role; a mod is welcome to move this though if I'm wrong, and thanks in advance. Do note that this is specifically referring to classes, as in the weaker versions of certain jobs that don't have job stones equipped.

It doesn't happen often, but I occasionally see thaumaturges, conjurers, and other classes with the rest of a Duty Finder team during higher-level content; this usually happens with alliance raids from my own experiences, but it's possible for that to happen in other areas too. Almost every single time when the player decides to type in chat, this ends up being a mistake that the player notices, and they either have to leave the instance early (thus incurring a penalty and leaving the rest of the party temporarily missing a player) or they end up sticking with it the whole duty (which objectively puts the party at a disadvantage compared to if the person was playing a job instead).

While this can initially be an amusing problem to run into, it stops being funny after the first or second time it occurs, and regardless of whether it was accidental versus on purpose, it begs the simple question: Why is any class able to sign up in the Duty Finder for content that's at level 30 or higher? I can see some people in Party Finder having class runs as a personal challenge, but it's annoying and unfair to others in Duty Finder when there are significantly less actions available to any members within the group.

And in case anyone thinks that it may due to spaghetti code reasons, I would like to point out that the system is already able to restrict certain jobs since "limited jobs" like Blue Mage are already locked from many Duty Finder instances unless they either play by themselves or with a pre-formed party via the Party Finder, so I don't buy that this couldn't simply be expanded to disallow classes as well, with the exception of allowing classes for content that's below level 30 of course.

Thanks a lot to any developers and designers who read this; your time is extremely appreciated.