[ZenGum]

I agree with your views on dark matter and dark energy as they are currently defined, as mere placeholders for "whatever-the-hell-it-is-that-is-causing-this-messy-result". Dark energy sounds better. But these probes are investigating and we might get a bit clearer about what DM and DE are.

But, your thoughts about us missing something important is exactly what motivated the Whitecoats to come up with the idea of Dark Matter/Energy. There is indeed at least one big gap still in our understanding of the world, and a nobel prize awaits the clever bunny who figures it out.