cause an imbalance on your scalp and you way overproduce as a response, hence hair getting gross fast.

Can we please stop spreading this myth? Scalps do not adjust sebum production based on how much is washed off. There's no way for dead hair cells to report oiliness to their follicles - they don't have nerves, they don't send signals.

Sebum production is controlled by hormones. Different people produce different amounts. If you find that washing your hair every few days will suffice for your skin/hair type, that's great. But that advice doesn't work for everyone. If someone with skin that naturally produces high amounts of sebum follows your advice, they may end up with Seborrheic Dermatitis, which can cause dandruff, hair damage, and hair loss.