So Ancients subspace technology is used in that way:
Melia- Sol node, in fututre some strategic outer rim nodes
Gate extension- outer rim nodes, some weak core wolds nodes (I can imagine some political bull**** of goverment about "We're proud to anounce that new highway... em I mean new stable node has been open to civilian traffic, now you can go from system X to system Y in one jump instead of two"
Odin- beyond outer rim assault
Neptune- beyond outer rim recon/exploration.
I wonder what would Ancienst say during first contact.
Ancient ship crew: sir, we have an incoming jump signature, it looks like one of ours, but... 5000 years old
BTW Now it looks like Terrans have a monopoly for jump drives/ships/gates that allow to travel via unstable nodes.
(Listen you stupid fish looking creature,if you wanna fly through my gate you have to pay. VAsudans be damned