My most upvoted comments on HN[0] are the ones that pick on some hyped up technology. HN loves to be "contrarian" (in quotes because this contrarianism is actually the mainstream position).

[0]: I don't think this is good, it's just a statement of fact.

It has been increasing. 5 years ago we were more hopeful. However the needed parts have not delivered and so we are rightly looking harder.

5 years ago self-driving cars looked like technologists were letting their imagination run away.

There's always "something" that technologist think is right around the corner, until they realize that the hard problems are harder than they anticipated.