Not only can we not find the dark matter or dark energy...
Look. We just recently mapped the Earth's radiation belts. Oops, they did not match prediction. At all. Not even the right number of belts.
Voyager is out exploring the Solar System's heliopause. Ooops, not as predicted.
That is the recent actual experimental work that has come out of cosmology lately. The rest of it is a lot of hand-waving using edge data points, at scales where nothing can be verified.
Compare that to the work that actual physicists do at the subatomic level, where experiments usually match predictions to insane numbers of decimal points. That is what real science looks like.
This stuff about, "oh we got our own neighborhood totally wrong, we don't understand how the solar system formed well enough to predict the heliopause, we don't understand our own planet well enough to predict the radiation belts, but when it comes to the really large measurements using edge data, we're really right-on, and sure of it." It is just total crap, at the flat-Earth level. Background radiation is the ultimate edge data; if Big Bang is true, it would be like God; an un-provabable hypothesis that science should ignore in preference of logical positivism. If it is true, we can't prove it, because we'll never have a sensor where we can test it on both sides of the value we want to measure. We can never calibrate a sensor, so we just can't know.
Maybe old photons just turn redder and redder and then die, and the cosmic background radiation is a giant field of dead photons that all average the same age because they then fade away after another n years. Maybe there is more than one cause of redshift; the cause we can verify at very tiny scales, and another one at cosmic scales that we haven't even tested for yet, or had the chance to test for yet. Nobody in academia wants to ask about that, because if they start the experiment now, they won't be the ones to write the papers in a few million years when the answer comes in.
Edge data tells us nothing. That the "early Universe" is presumed to have simpler laws of physics reminds of me something. The way that trees on the horizon at the edge of my vision appear simpler and simpler; and yet retain all their symmetries.