I love future meta predictions
My 2c:
1. Station plating not being tissue paper does not mean they'll be invulnerable barrier. I'm sure that even if we get chance to switch them for oninum, with enough dedication you can still create other entrances than those intended by station designers. So defending the entire surface will be important, as well as designing internals to give defenders advantage in CQC.
2. Stations being defensible is IMO a good thing. I'd never even attempt to defend open-frame megastations on the ground. So despite EBM limitations, it's still upgrade from "pretty pre-made background prop" to "ugly but important gameplay object we can design around".
3. It's (kind of) confirmed that to store ships on player stations, you need hangars. Each of them need access for the ships to fly into. That creates quite big opening.
4. There are few other facilities mentioned here and there on the roadmap:
-cap ship hangar, requiring (I presume) even bigger opening.
-gas capture, storage and refining. Storage and refining fits nicely inside, but collectors may benefit from spreading them far away from each other and/or having as little other station parts around them as possible (open frames)
-solar panels require large flat surfaces. That's helping the flat box design sadly.
-big ass reactors. If they blow up into really big fireball, it may encourage spacing that part of the station from the rest.
-pipes/conveyors for transporting resources can both create openings in the outer shell, as well as need for maintenance corridors through the station
-warp gates. Require external placement.
5. More game mechanics could be created to encourage spreading apart the facilities. I.e. some heat mechanic that decrease machinery efficiency based on their distance from heat sources. So i.e. a turret close to refinery would have it's ROF reduced.
So in the end an optimally functional station may look more like that:
With a central, heavily armoured bunker hosting all the facilities that don't need spacing up (hangars, storage), and spacious open frame connecting those that do (reactors and gas collectors)
So still a box, but at lest with tentacles.
My biggest issues with EBM is no blueprint saving (station need to be recreated block by block every time) and no non-90 degree angle support.
Building it by hand every time give the potential that each station will be unique. But it's so tedious and time consuming that pretty quick anyone competitive will go for a big grey box.
IMO ideal solution would be SSC-like editor for large sections (up to (100m)^3 each), with a "connection port" device for connecting those sections together on site.
Each section would be treated by game as separate entity for downloading/LoD related stuff.
Blueprints would be filled the same way as the ships gonna be build on player stations. But instead of factory hall, a construction ship would do the filling.
guide the meta a lot more than just cramming a massive grey box there
I'm very curious what you have in mind in that regard.