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From New Atlas:
Some of the strongest evidence for dark matter to date has been discovered – and ironically, that's thanks to its absence. In a pair of studies published this week, astronomers have shed new light on dark matter through close observation of a galaxy previously found to have very little of the stuff, while the same team found a new example of a similar oddball galaxy.
It's generally believed that galaxies are held together through the gravitational influence of clumps of dark matter, so to find a galaxy with little to no dark matter was a surprise. And while it might sound like a strike against the theory, it actually ends up supporting it.
A Second Galaxy Missing Dark Matter in the NGC 1052 Group (DOI: 10.3847/2041-8213/ab0d92) (DX)
Still Missing Dark Matter: KCWI High-resolution Stellar Kinematics of NGC1052-DF2 (DOI: 10.3847/2041-8213/ab0e8c) (DX)
(Score: 1) by khallow on Tuesday April 02 2019, @10:44AM
To the contrary, small object near a large object (where the weakly interacting matter can be drawn off by gravitation interference) is one such place. It predicts the existence of galaxies without much in the way of dark matter. The mechanism of creation conveniently falls under the external field effect (EFE) assumption.
Two have already been mentioned. The initial weak gravity deviation from Newtonian mechanics. And the EFE assumption. Neither has physical explanation. It just fits data, just like the dark matter assumption does.
In other words, "simple relationship where you plug in values for the surrounding mass". We already know the universe has priors since distribution of matter follows no simple relation on any scale we can observe. So dark matter priors is not even a little bit of a stretch.