I ended up staying up late reading the timeline on Wookiepedia, and it looks as if the conclusion there is that what's happening at the time of Light of the Jedi is that there's been a lot of work done on finding and cataloguing new hyperspace routes - it sounds like hyperspace has been a thing for millennia, but also as if the push into the Outer Rim is much more recent. (I may have disappeared down a few rabbit holes on the way!)
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Date: 2021-09-13 03:28 pm (UTC)