On top of everything else... would YOU trust a conscript to escape your grasp?
Unless the 'ride-along' teleport is a canon thing, anyone who tries to use Mass Aetheryte transport as a war tactic needs to work with the fact that your soldiers are going to each be finding their own way across the Aetherial Sea... which means if they're a conscript... you're giving them license to maybe just run off to ANYWHERE they think you won't be able to reach them.
Also, if Mass Teleport IS a thing... it's likely even rarer than the skill to teleport just yourself.
