To be fair, Markdown was one of those "small random projects" that unexpectedly took root.
Its spec is pretty ambigous and closed to extension, requiring anyone wanting some more features (e.g. video embed) to either tweak with raw HTML or to create some custom syntax.
AsciiDoc or reST are pretty much the best for simplicity and extensibility but strictness, but are less popular, sadly.
for sure! I debated adding shortcodes as one of the "mistakes". but figured it was beyond project goals.
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