Quote Originally Posted by Danest
We would need significant city populations, unless we want a depopulated Rome(though I suppose the limit of Romans was an issue, hence auxiliaries). But the AI might not know it, and depopulate its cities (if it were a rich faction capable of supporting such large armies).
And I think, at least professional armies like the Legions didn't just pop up but most likely had quite significant training periods. But then, maybe being able to produce several legions in 0 time is better than a giant city being able to produce no greater number of units per turn than a village. So maybe only really special/exotic/expensive/rare units should take more than 0 turns to build? Cavalry, elephants, etc? But I bet EB already has their plan for build times in place, and that's fine either way.
Exactly right. The strength of a legion was in it's training.