A serious quantum-resistance upgrade for Bitcoin would be one of the most complex, politically loaded, and coordination-fragile events in its history. It touches every private key, every wallet, every L2, every custody stack. It’s also a perfect vector for capture, centralization, and “safety”-framed control.

None of these claims are true

A BIP could just introduce an optional additional signature algorithm. Nobody has to change their existing private keys, wallets, L2s do not have to adopt it right away. There is no reason why an additional algorithm should lead to centalization