“But suddenly when it comes to Purim, after we made sure we heard every single word of the megillah, and we gave tzdakah to many many ani’yim, suddenly we can rely on the most meikil shita in achronim.”
A mitzvah can’t be done b’simchah unless there are at least a thousand MO people telling you it’s wrong. It just keeps the balance in teh world. It’s all necessary.