Exactly, think of the term dark matter as a placeholder term designed to assist in creating a mathematical model of spacetime.

Placeholder terms are recognition that science (and maths) rely on incremental progress in our understanding of the Universe.

There are Nobel Prizes awaiting the minds that can provide a coherent understanding of the phenomenon that doesn't interact at all with electromagnetism but does so strongly with gravity.

A future more complex mathematical model of spacetime will assist astronauts to make the journey through a wormhole to an interesting exoplanet and perhaps interact with another species. Hopefully a peaceful interaction.

We inhabit interesting times.