That if I do not RP with both Susan and Fred precisely equal amounts, I am being a bad staffer and doing it wrong.... But what's been bothering me on some level is the implication of these rules: that staff are inherently obligated to do certain things, whether or not staff themselves have pledged to do so.
This may be an unpopular opinion, but here goes: Nobody - and I mean nobody - is entitled to my free time. It is for me to spend as I choose. If RPing with Fred is excruciating, then I'm not gonna RP with Fred, as player or as staff. The only thing I am obliged to do is that which I have willingly pledged myself to do, and that does not include providing everyone NPC-RP on demand or in equal measure.
What I do pledge, though, is to "provide a sane, fair and friendly environment for you to tell your stories." Part of that fairness means ensuring that Fred has the same opportunities for success as my BFF Mary. I do not need to RP with him to do this. Off-camera scenes and +rolls are a thing for this very reason.
If that's a dealbreaker for you, don't play on my game. Problem solved.