There's no point in starting over from scratch if you can't explain how things would go differently. And if you can explain how things would go differently, it

There's no point in starting over from scratch if you can't explain how things would go differently. And if you can explain how things would go differently, it's worth considering whether that could be a patch on the existing system, instead of paying the cost to rebuild from scratch and possibly introduce a new set of problems. I suspect many who advocate for burn-it-all-down utopianism are not interested in solving problems for their own sake. It's the same impulse that inspires engineers to rewrite perfectly good software just because they don't like some aesthetic details of the code. That's fine if you do it on your own time. Go ahead, create a small-scale utopia and see if it works as well as predicted. Even if it fails, it can serve as a valuable data point for the rest of us.