Counterargument: I started Canny and we were a "build in public" startup early on. Building in public was an invaluable marketing channel in the early days.

When you are just launching your product, it's really difficult to get those first users and any awareness at all.

If your target audience includes other people in tech, then building in public can be great marketing channel.

Posting about your ideas or your product just isn't that interesting. Posting how much money you're making is very interesting to other people who might want to follow your path.

Like all successful marketing channels, this channel is a lot more saturated these days than when we started (~2017), so it might not work as well anymore.