"Don't be curmudgeonly. Thoughtful criticism is fine, but please don't be rigidly or generically negative."

https://news.ycombinator.com/newsguidelines.html

It’s not craze. It’s technology shift. Bitcoin and 3D printing were craze. It’s like a move from analog photography to digital. I am telling you this as a very conservative person. Even for me it’s helpful.