>One of the biggest drawbacks for blockchain is that transactions can't be revoked after the fact

Yes that is a major double-edged sword but it is ultimately a feature of blockchains (at least the base layer), not a bug. Everyone who has ever been a victim of fraudulent chargebacks can vouch for that. If you want reversibility you are free to create a smart contract which allows that using its own token. Frankly I wouldn't want to use a blockchain where someone can acquire my personal info and then social engineer their way into stealing my money, as commonly happens within the traditional financial system.