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References: [1] out of his ass
(mander.xyz)
A place for majestic STEMLORD peacocking, as well as memes about the realities of working in a lab.

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This is a science community. We use the Dawkins definition of meme.
As I understand it, the "matter" part is a hold over from physicists trying to fix their faulty calculations.
Looking for "matter" that only interacts with gravity is a bit like looking for the perfectly smooth frictionless plane. I mean, somethings gotta account for the sums being off, but the real world explanation is anybody's guess.