For example "irrevocability of transactions" is fixable by introducing arbitrators. This has the huge benefit of making the trade off explicit and still allowing for irrevocable transactions. With 2-of-3 multi-sig escrow services can be implemented in a decentralized and trust less way (if both parties agree no escrow agent has to be involved).

Handling private keys has also become much simpler in the past years due to hardware wallets and hierarchical deterministic keys. But I can see why someone could not want to be responsible for the safekeeping of their savings.