And what happens if one of the parties is not willing? If someone's e-wallet gets broken into and funds are transferred? How does any current system handle that situation?
A lot of folks consider irreversibility a feature, when there's a strong case to be made that it is a bug.
What this means to me is that cryptocurrencies are not for anybody. We don't have to create digital systems with the limitations of cash. We haven't had to do that for decades. Now there's a push to go back to the time before that, for (in general) no discernible reason besides people gambling on the price.
I would think it was the exact opposite.
A 'regular' bank account has reversibility, and so if there are some shenanigans you can (potentially) get your money back. With a cryptocurrency 'bank account' (wallet), if anything bad happens you're SOL.