Let's check the first one:

Systemd-manager-TUI: A TUI application for managing systemd services

Somebody said that they use this, so it is not a 'show off' project.

You realise you made a silly sweeping generalisation right? People actually use them.

I don't know why you're so aggressively attacking the idea of people making projects to show off.

The claim isn't that zero people use them, or that all TUI projects are made to show off. But most of the TUIs you see land on HN are things somebody made to play around with a technology / scratch a momentary itch.

No shade on those people; making a project that brings the author joy is an awesome reason to make something, and sharing it with folks here is one of the better things about this site. But the TUIs you see here are, by and large, not aiming for (and not going to get) broad adoption.