Just came here to ask about this same thing.

I agree that if it's intended that they should be unfinishable, they should at least count as failed for the purposes of no longer showing in the active quest log.
It sort of makes sense that he's too grief-stricken to care about his staff any more (besides, it's way better than Jahan's old one... ャ_ャ). He could at least have paid Mendius for the quest though. He is still the mayor after all, daughter or no daughter.
I just feel sorry for his poor wife, how long is she going to be locked away in that bathroom for now? ャ_ャ