Being able to leverage crypto on this scale requires everyone to either A) be technical enough to understand and use smart contracts directly or B) delegate a party that handles this for you. This is where the utopian case usually falls apart, because most people are B and this requires trusting a third party, which kinda defeats the entire point of the vision.
Because most people don't want to do the work of learning and managing crypto directly, a huge industry flourished to service these people, full of its own interests, corruption and various levels of criminality. And well-intentioned crypto people have no way to reign this industry in because the entire point is to operate in a deregulated way.
Ironically, the piece that makes crypto fundamentally unworkable 20 years in is capitalism.
Specifically, you had to claim your rewards in a certain time window or they'd disappear.