I remember reading about an interesting paper that could explain some weird astrophysics by just correctly applying general relativity. The explained weirdness came from mass currents. Strangely I never hear about this when dark matter is discussed. It’s always “Newton mechanics has to be extended somehow”.

Yes, why not start with the widely accepted extension called general relativity? I understand GR most likely does not explain everything, but that doesn’t mean you can take the bits and pieces it does explain and use those to underpin your pet theory…

All this makes me a bit skeptical of the whole area to be honest.