Zim wiki is brilliant. I've been using it for years. It's very extendable

> Zim handles several types of markup, like headings, bullet lists and of course bold, italic and highlighted.

OK, I think this may be a bit less powerful than Notion and Obsidian.

A good bit less powerful yes. But the simplicity is a huge strength when it comes to long term tech. I started using it in 2012 I believe.

The most important thing in any note taking app is to use it consistently and use it for years. And bring it with you as you change jobs.

Sometimes simple things that work in plain text files that can be exported and imported easily is what you need for long term note taking.