forgot to reply to this bit:
So intelligence gathering isn't useful? Or the ability to project fighter power over multiple systems? Or not having to sent the core of your fleet (destroyer) trough a node in to hostile system but instead cleaning the area first with fighters and bombers
It does matter, but it would take a lot of fighters and bombers to clean the area given the general suckiness of great war era Vasudan ships. Even in the tech description of the Aten it says very clearly that it is stronger most Vasudan warships, so they must have had other kinds of cruisers which were even worse.
I still think that it evened the score and allowed the war to degenerate into a stalemate. Terrans had stronger ships and better weapons, but the Zods had better propulsion systems. It does even things out if you think about it.
So why didn't they share this tech? Probably because after fighting a major war against the Terrans for 14 years they were not too willing to give up their trump card. It was a big deal when the Terrans figured it out because it was the only way to beat the Lucifer. The PVN was mostly wiped out by that point.