Either the Builders have super long range drives or perhaps our region is in a wasteland with not much here of worth? We cant know and wont till we actually run into it. I would not be surprised if the Hegemony has some knowledge of the tesseracts but cant use them well. Their supposed holding are large enough that they would be near essential to maintain any real connections. Perhaps they dont hard control because no need and dont have resources to just squat on them? Or at least the known junction since it is right next to clan holdings? Frankly as shit as everyone else seems to be with sensor tech and actually exploring we could probable set up a station on the junctions and use it a very long time before anyone notices if ever.We still didn't encounter anyone who actually knows about Tesseracts, and if there was something on the other side that actually has control or understanding of the phenomenon, we would already encounter their scouts, patrols, or invasion fleets. Actually, they would already build their civilization around the phenomenon, like civilization in Mass Effect were built around Mass Relays. Yet, there seems to be no one out there. Unless Hegemony steals the knowledge of the Tessaract from us. Considering that our security it is possible they already did, they just can't use it against us because both ends we do know are in space not accessible to them conventionally. It seems that Tessaract requires our input on the matter.
Technology to make war against Hegemony easier is meaningful if we can justify the war... which means we have to wait at least a couple of turns