Nah, supporters of most of the tech (chemistry, biology, EE, whatever) can easy explain applications to layman, as well as explain why one would use it over alternatives.

There are some exceptions of course -- one example is "memristors", an very specialized EE concept that claims to revolutionize computing for least 20 years and yet never does. And if you look at its HN discussions, you'll see mostly skepticism and negativity, kinda like for blockchains.