We should be cautious to say this is so and so,..in the end its all work in progress.
In fact we know nothing as long as we judge the tree by its visible parts.
And with visible in this context i mean what we can grasp with our current set of detecting options,and the bad habit of established science circles to ignore anomalous phenomena.
In that regard Dark energy and dark matter are just bad choosen descriptions for the terminus "ignorance".
And then constructing theories which carefully avoid those blank knowledge spots just to have something that works.
If you got a system with certain elements in it ,you surely can construct theories about the nature of the relations between these elements, have "working" theories to some extend and yet believing ultimately in a fundamentally wrong approach which becomes visible in the aforementioned anomalies.
One example for this would be the Planetary Position effect on short wave signal quality,which is one tip of the iceberg in regard to this topic imho.
And consequently all implications get carefully ignored.
If its wished i will elaborate on this further in depth,atm however it would burst the frame of this post.