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It is widely used and offers more features than Markdown. It is much better for techinical documentation in many cases.

What's wrong about that? Not that I would have made a deep analysis, but the Linux kernel developers did not that many years ago and chose rst.

Yeah. Didn't know GitHub can render reStructuredText.

It can render mediawiki, textile, pod, org-mode, and a bunch of other text formats as well.