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Quic is implemented over UDP. It's literally running over datagrams.

Everything at some layer has to run over datagrams, since that's what IP is.

This is literally the point of the article: if you want to create a protocol over raw datagrams, you have to implement a lot of things that are very hard to get right, so you should just use QUIC instead, which does them for you.

"You" is doing all the hard work. Apps should use reliable sessions and transport, almost all the time? No disagree. The exceptions are understood. But don't pretend the substrate is that reliable data stream. "We" have to construct it almost always. We do reliable for you, over UDP.

I don't do this stuff any more, but I worked on OSI transport and remote operations service mapped to UDP and other protocols back in the 80s

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