I understand that often, we think something new will solve all our problems, but it only changes how they look and the old solution ends up being good enough already.

However, isn't it kind of pessimistic to think that there's nothing new to learn from rebuilding existing institutions from the ground up based on new knowledge?

I'm by no mean a crypto apologist. I think it's important to discuss why those new ideas fail and what we can learn from them in the future rather than mock them for trying to reinvent the wheel.