I just wish people would start building this kind of stuff around Asciidoc and not Markdown. Markdown works fine for notes and short how-to's but once you move into longer manuals that need more structure elements you quickly run out of options.
Where Markdown comes short for me is presentation layout. The only worthy contender of LaTeX so far is Typst. I’ve made my resume and my slides with Typst, and it’s amazing.
I really like SciPress, and I think a web-based VSCode with the right plugins and a presentation layer holds a LOT of potential.
Note that Scipress Markdown supports "directives" which in turn means I can include all types of elements like popovers, blur screens, paywalls, etc.