I am probably in the 90th percentile of TeX users, but I have to say that it's hard for me to think that there's much space between markdown and TeX for another typesetting language. Markdown is easy to write and read but very constrained, while TeX is a bit harder and essentially infinitely flexible.
The biggest issue I have seen with TeX is a people problem: people frequently write spaghetti TeX with horrible style. This is terrible, but it is not actually a language issue. Writing it with a "docs are code" mindset can produce some very clean results. The second biggest issue is that there isn't a good TeX -> HTML compiler.
The biggest issue I have seen with TeX is a people problem: people frequently write spaghetti TeX with horrible style. This is terrible, but it is not actually a language issue. Writing it with a "docs are code" mindset can produce some very clean results. The second biggest issue is that there isn't a good TeX -> HTML compiler.