In NMS, I build small mining outposts on planets rich in valuable metals. I have a main base that acts as my exploration hub / research facility / greenhouse. I also sometimes build small observation outposts on planets with unique life, etc. Oh, and there's the new underwater bases and submarines!!!What gameplay do you envisage your base providing beyond "I can haz house"?
In ED, there's a region in deep space I "own" that I'd love to set up a remote outpost at, especially if it had some sort of "Stellar Cartography" computer that allowed me to turn in exploration data, hangars to park some of my other ships, outfitting to change modules, etc. I would basically use it the way people currently are using things like that new station by Sag A.
The other reason I enjoy base-building in a game like NMS is that it gives me a whole lot of user-created content to explore. Do a search on NMS bases, and you'll see some amazing feats of architecture and clever design. I find player-added content way more interesting than the cookie-cutter stuff developers put in (seen one, seen one hundred). It would be really cool to come across player bases while out exploring in ED - I suspect they would be much more interesting than typical INARA bases, Guardian ruins, etc.
And once VR comes to NMS and I can walk around inside the bases I build.... YES!!!! But NMS is not ED. I wish it had realistic solar systems and ships and stations rather than simulating a Saturday-morning cartoon. However, I really love the base-building aspect of it, and would love, love, love to have this in ED.