It is because the jury is out on the matter of; dark energy, inflation and dark matter is the reason why a simple explanation of all three mysteries with the addition of one unseen force of an anti space is so intriguing and enticingly elegant.

Actually the mystery of dark matter may revolve around the left over energies and non interactive particles left over from duality explosions like matter anti matter.

Inflation, dark energy and expansion mysteries may involve the new aspects of space we have not considered until now.

While the jury is out we can rely on some measurements we already have and add our own 2 bits.

For now everyone can play.