ill answer this question base on my experience.
While experimenting on poorman,s advance tele many months ago i found out the academy is essntial if you want to take advantage of the tech you upgraded.
Here is what happen.
I settled 100 miles away to move closer to an enemy once there i move 4k trans and 10k ballistas along with a good size army.
When i got there i wanted to jump from a level 1 City to level 5 via ballistas spam with minimum or zero loses which takes rather long.
Level 1 academy lost alot of ballistas.
as i leveled up my academy the lose stopped, i cant remember what level it takes to stop the losses, since i used speed up till level 7.
There are alot of benefit to having an academy which far out weight by not having it.
Experiement with it.
As a last note, Academy is like a library, all upgraded tech is there just as as long as you have the academy.



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