"No, not at present - but there will be in the future" That seems to imply that until that future arrives, people should mostly stay away from cybercurrencies.

I am bringing all this up because when cybercurrencies were getting started, the people boosting them assured us that they would soon be doing all sorts of wonderful things, and nothing bad would happen. That prediction turned out to be wildly mistaken. And instead of considering that maybe the idea itself is just basically bad, in the years since they keep insisting that soon it will all be fixed.

Can you understand why, given this long history, I would be dubious? Or is it your view that I am under some sort of moral obligation to believe that the approaches to fixing it being worked on at present are absolutely certain to work?