Bitfinex had inadequate security, that much is now proven. But more problematic, there is no such thing as provably adequate security for holding other people's

Bitfinex had inadequate security, that much is now proven. But more problematic, there is no such thing as provably adequate security for holding other people's private wallet keys. Any flaw in the process of generating or storing the keys is essentially the mother of all bug bounties. That is why over time, I hope that a decentralized method of exchanging digital assets will be used more widely.