I don't think you can compare things like bad hips in a dog to the wobble in a BP. The wobble doesn't seem to distress them, it doesn't interfere in their desire to eat(might make it harder for them to strike well) and doesn't stop them from breeding. They crawl about, look at things, eat prey items, coil up and sit there like a rock... everything that a normal BP does.

I've had friends with disorders/injuries that give them a palsy and although they wish they didn't have the palsy, and it creates some issues, they've said that it was not particularly painful nor distressing once they got used to the condition.

Since a spider hatches out with the condition, it's never known any different. with mine(who wobbles a lot), I simply prekill all of her food, and she eats quite readily. In fact, she rarely ever misses a meal. I named her Hepburn for her elegance and poise... and for the palsy.