People keep reinventing LaTeX, but poorly. Most of the issues described have already been solved by it at least 20 years ago, especially the semantics part. The tooling is mature, well understood and supported on all operating systems.
As far as custom shortforms for fully tagged angle-bracket markup is concerned, people are reinventing SGML which can handle markdown and other custom syntaxes since 1986.
tannhaeuser|3 months ago
rssoconnor|3 months ago