This is literally my thoughts condensed in text. The only reason I do not use an org-mode is that I am a Vim user.

MD won because it's HTML in a short form and HTML already won because of the web. The adoption of MD as the primary format that LLMs use to read and write doc just sealed the deal. It's a classic case of "worse is better."[0]

[0] https://en.wikipedia.org/wiki/Worse_is_better