At the risk or being labelled an old curmudgeon, I must admit that I was 'imprinted' with WordStar (roughly similar to "emacs", but very, very basic) over the course of 7 or 8 years in the 1980s. Consequently, I really only feel comfortable with WordStar or a modern clone.

I use "jstar" which is the 'WordStar persona' of the "joe" text-editor. I even renamed it to "ws".

Back in the late 80s when I was a kid I played with Wordstar. But is it suitable for technical stuffs like programming?

Of course it is. Text-editing is text-editing. It requires even fewer 'features' than word-processing, though there is quite a bit of overlap between the two.

Note that a text-editor is not an IDE. When developing, I text-edit the source code, then I invoke the compiler. If necessary, I can then invoke the debugger.

It's just as quick to do that from the CLI as bouncing around inside an IDE.

EDIT: To answer your original question, I still do some programming in 8-bit CP/M. My text-editor for that is actual original WordStar.

I use vscode in Utunbu vm to code python pet projects. I also use Datagrip and pycharm for my data analyst work.