I believe that the pressure for these systems cannot be introduced because of absence of local equilibrium. In our paper
Melkikh A.V., Melkikh E.A. Can we use thermodynamics in the systems with gravity? Modern Physics Letters B, (2017).
it was shown, that the term "pressure" is fundamentally connected to the existence of local equilibrium and cannot be introduced without it.
Article Can we use thermodynamics in the systems with gravity?
What if DE and DM are a complementary system with local pressure, the part of gravitational wholeness just outside of local equilibrium, emergent phenomenon?
If they are outside of local equilibrium it is impossible to introduce the term "pressure".
Just that I agree on. There is no need for pressure of DE/DM. The spatial ordering and the space affected by matter could be separated influences.
Moreover it is not obvious that diring inflation stage we can introduce pressure.
If inflation stage was real, I prefer it was "spatial ordering" to space created by pressure. Vice versa the matter and pressure can be products of inflation...
To be sure, it's not obvious also that there were any inflation. Topological defects could have developed from big picture to details, when the paradigma is on the contrary from details to the wholeness...
I agree that other variants without inflation are possible. In any case the question about pressure remains.
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