Soulgazer

So I only recently got the Arcanum Unbounded and Oathbringer, and the info contained within is...confusing. Up to this point, I had assumed that worldhoppers were exceptionally rare. After all, most planets possess only one perpendicularity, often in difficult to use places, and about half of the currently named shardworlds are a mess in the cognitive realm or otherwise unavailable. I had assumed that the interstellar community was limited to mostly Hoid, Khriss and the 17th Shard. But wait, now there's a entire city in the Cognitive Realm with its own university? There's factions like the Ire, and a functional interstellar economy that uses places like the Pits of Hathsin (a heavily guarded location in the Final Empire) as a trade route? How many worldhoppers are there, and how are they moving between planets in any significant numbers without causing a fuss?