[@shylarah] I highly doubt the Seminary cares whatsoever about a pupil's feelings regarding their warsiblings or if they're feeling too cooped up. Remember, this is a civilization that uses an entire cultural group of people as fuel, and the Red Seminary is probably the most brutal place in all the empire. Concepts like freewill and comfort are unknown there. Kids are fashioned into weapons, and nothing else matters.

 Warbands are meant to be kept together for decades, if not forever. While some inquisitors do rise in the ranks and break off eventually, most remain as part of their warband indefinitely. They are trained to be cohesive fighting units, with each member of the group being given a vital role in combat operations. During training, they learn to rely on each other in order to survive, otherwise they can easily lose their lives. Twelve years of this usually forges a warband into a singular, powerful unit of fighters. Those who can't cope with this were gotten rid of long ago. 

That being said, it's not like they were completely isolated and cloistered away from the rest of humanity, they saw the other warbands twice a month during training exercises/competitions, and they could also interact with anyone within the Seminary. They also had outside influences like SA soldiers and civilian teachers and the like coming in to lecture them (at least Phoenix did, since it was Creid's practice). It's meant to be less like a school and more like bootcamp, where recruits are separated into different companies and learn to rely and trust each other, but taken to an extreme.