That's actually true, but the Waitress Job definitely becomes harder if you don't have 0% fatigue. Also whether you're able to keep the desire low at a full bar depends on the your willpower level in the first place. I didn't mention it but I mostly did my shifts after clearing enemies, putting me at 15-25% fatigue. Otherwise its sadly too easy, yes.
For the receptionist job, the desire pretty much doesn't matter, because who cares if Karryn has 100% mouth desire if the pervert still *asks* her whether he can kiss her. And who cares if you have 100% butt desire if you can just shove the goblin away in the first place?
The problem is that willpower doesn't matter in the receptionist job. You lose it anyways doing paper work, so keeping your desires low is impossible after x minutes of work. At that point you *have* to shove the goblins away if you don't want to get groped, which costs stamina. Now you might think 'Hey, you have to decide between spending time and stamina between doing paper work which grants control or keeping the goblins away to remain pure', but that's not even true because the goblins will deal stamina damage once they reach anyways. So just showing the goblins away and not getting a lot of work done becomes the best play, which obviously super boring. Every now and then you're stuck shaking someones hand which will enable a goblin to come closer and strip you, but otherwise there is no exitement.