I was with you until that last sentence. That was not only moving the goalposts, but transplanting them to the outer reaches of the solar system.
If you honestly can't see the difference between something done as a hobby and a complex, highly technical specialty that people's lives depend on, then my friend, I can only quote Hector Maure at you:
Para qué seguir mintiendo?
Andá y buscate, mi hijita,
quién te saque la tierrita
que tenés en la cabeza..
Ah, but you have made an assumption about my meaning, but even if you had not, I would say that dancing is very much more than a hobby for lots of people, and they take their dancing very seriously indeed. But no, the reason I mentioned medics is that at the hospital your starting position is that you trust that the doctor is properly qualified for his work. You don't think to doubt that he knows what he's doing. You know he is, well, a doctor.
Now, when you come along to a dance school, as a beginning dancer, you don't know anything very much about the dance you want to learn. Lots of students take for granted that the staff are properly trained for their work. If their lives depended on the outcome of the class, they might actually check, but by-and-large they trust that the teacher knows what he is doing.
My own rather modest ambition for the certification of dance teachers is that they actually do. That's all.