What is "unsubstantive"? Valuations have sky rocketed, frauds are being uncovered slowly, investments are looking shaky. So,the VC world has to start the PR circuit. "Don't listen to the haters, they are unsuccessful losers. We thoughtful people dont mess up" fits right in, no?

How someone who lives and works in the tech world can't see the cracks is astonishing. This is how economic cycles work.

Your comment was a dismissive one-liner, the leading genre of unsubstantiveness.

Even your post here is a caricature. People have been saying such things for years. In fact, unless I'm mistaken, you yourself have been repeating such things on this very site for years. Predictability is always unsubstantive, because it adds no new information, and indignant predictability especially so. HN is supposed to be for curious conversation. Reductive hops to angry places—note the word 'simply' in your comment above—are the opposite of that.

The trouble with such comments is not that they're wrong. Maybe you're right about economic cycles, who knows? Maybe the people who you assume can't see things actually see the very same things that you see, who knows? The problem is rather that such comments don't show the reader anything, except how you feel—which could also be interesting, except that you're not talking about it directly.