I would love to see some more features that grow, some might be akin-ish to Garrison, but I think in a general sense of just simply adding instanced housing (either apartments getting upgraded or whatever other option) that Jojoya has the exact right of it.

I wouldn't worry about that personally.

Although on that note, assuming SE doesn't use it for the housing system, I think Airships could be pretty cool feature to the game that has some of the concepts WoW's Garrisons had. Some mission table stuff, perhaps adding a new use to your Squadrons (where trusts are now taking their place), and because it works within the zone ideally it would be an even smoother experience and less of a issue than garrisons. Say for example you could hear the shout chat if your airship was about Limsa, and while there would be some war table, chocobo, or whatever cool new progression features, they'd not add market boards so you'd definitely still have to go into town. As well seeing your airship from town would be cool, so many might park their ship outside and then leave just to see their ship like that.

I like the idea of an outpost / garrison but you just have to make sure it doesn't demand players attention 24 / 7 or can easily substitute the rest of the world. That and I also think the garrison concept is memory lite enough that it could work well in our current landscape where houses take so much memory that they're hard for SE to add (from 20 nodes of options you could have vastly different looking ships - and due to their interior exterior design could hopefully be easy to quickly load within zone and display, unlike needing the 200+ houses require), and they'd also be auto-decorated in a sense (you get options but like Inn rooms SE puts down the objects of the theme you choose) which is a bonus for many players who don't want to be decorators. Of course WoW had limited visual options, which I'm not suggesting to replicate, here you'd get to design your airship with rooms and exterior choices such that each person's airship could look very different (while still offering some awesome features like a garrison might have and behave as a nice progression system to be your buddy).