Worth separating two things. The breach hit a signing machine and a pooled hot wallet; Bitcoin's rules were unchanged that day. Every coin that left did so because a third party held the key at that moment. That makes p2p one route to self-custody rather than the only remaining market. And a p2p trade still carries a fiat leg, where chargebacks and faked payment proofs live. I would rather see fewer people holding exchange balances than more people meeting strangers with cash.