But "dark matter" is just a name for any of these Maaaaaany "explanations." Nobody's attributing any intentionality or qualities not already observed to it.
That is wrong; there are many alternatives to dark matter, and if any of these alternatives happens to be true, the DM hypothesis would be falsified
The observation:
gravitational effects which cannot be explained by general relativity unless more matter is present than can be seen.
Some alternatives are:
1 General Relativity is wrong
2 Scientists are not measuring the amount of matter correctly
3 Laws of gravity are different in other galaxies,
4 regular matter is producing the effect, dust, asteroids, black holes etc. (we just can´t detect it)
5 we live in a simulation, the observations are just glitches of this simulation
6 scientists are just lying and making up stuff in a big crazy conspiracy
7 Dark matter, there is a substance that has no light, nor energy, but it does has gravity that is causing this effect
We both agree on that 7 is the best alternative , My point is that anyone who disagrees and claims that 7 is not the best alternative, is expected to suggest an other alternative and sow that this alternative is better. Agree? (YES)
The same is true with any other hypothesis/theory/theorem/ecuation/ etc, anyone who claims that common ancestry is not the best explanation for genetic similarities, or that the heliocentric model is not the best, etc. is expected to provide an alternative agree? YES
So why are you making an arbitrary exception with the origin of the universe and God?