These topics are orthogonal to the technology. It's perfectly possible to create tokens using smart contracts on the ethereum blockchain that have keys that ca

These topics are orthogonal to the technology. It's perfectly possible to create tokens using smart contracts on the ethereum blockchain that have keys that can reverse transactions. I deployed a simple one to a testnet a while back as a proof of concept for a bank (any time an enforcement action was taken, a reason had to be provided, and it was broadcast as an event). And just because you're using a smart contract, doesn't mean that the legal system of the jurisdiction you're in no longer has an opinion or the ability to make judgements against you. So, I agree, some of these things are features not bugs to normal humans, but to most cryptocurrency enthusiasts they are anathema. Ultimately we'll need systems that are a bit more friendly to error. It's early days though, and the technology is flexible enough to incorporate nearly any kind of system you want.