I think it just makes the most sense to have it in Limsa since it's a port city and is where the Fisherman's guild is based.

That said it would be nice if they stuck the NPC you need to talk to a bit higher up, like on a box or something, so it's at least easier to click her amid the big crowd that's constantly shifting/phasing in and out every time you move during primetime...

I'm not sure what they can do about the load times though. Short of maybe instancing it and putting an Aetheryte there maybe? Idk how feasible that would be though. Maybe they'll expand to other areas eventually, there could be some neat routes if they do. Like from Kugane maybe. Maybe unlikely, but would be neat.