Cause there's no reason why not.

Mmm. Yeah, maybe, eventually. When they're at least in every capitol. Not worth the effort yet.

And I don't know about the "no reason", we'll have to see how well it works in practice. NPCs are notorious for issues during docking.

Small NPC ships dock like players
NPC CapShips? They'd dock upside down or sideways

Or somehow manage to implant themselves into the station repeatedly.