In my game, Felella is a little further behind in progress on her career, but that's because she's taken care of two kids for two years each (one she's still caring for)! Plus, she and Zest are both at Apprentice level. Zest gets higher pay, but that's because his job is simply higher paying. And just a moment ago I saw Zest dusting the furniture - with no prompt from me.

I just don't see the inequality of which you speak. (And trust me, if I did, I'd have issue with it)