Privacy is scary, so we mustn't implement this BIP! Bitcoin's transparency is actually a selling point somehow and not just some sort of cope!

Also making any change at all to bitcoin would fracture the ecosystem which might hurt the price of bitcoin! Don't you remember the blocksize wars. NO NOT MY HECKING BTC BAGS.

Besides, everyone will just use bitcoin custodial in the future, so none of this actually matters. The only feature of bitcoin that matters is the capped supply which is what makes it a free money machine.