[Discussion] Why isn't there a horizontal rule?

[Draco Metallium (Rodrigo S. Cañibano)]

Hi!

I was going to send a long and passionate defence for the inclusion of
the horizontal rule (or "The Thematic Break" according to mozilla web
docs) when a line started with three hyphens. But on the last
paragraph I just realize I had to check the mailing list archive
before, and it turns out it had been already proposed, and not only
that, but I can't find a counter argument:

=> https://mailing-list-archive.gemi.dev/www/2020/000375.html

I'm wondering now: why wasn't it accepted? Was it just forgotten?

Thanks for your time!
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Draco Metallium