Every dock station has the same paint/scuff marks on the pillars, for example. And it makes sense they intended to upgrade these to individual unique items, because why have a galaxy filled with unique planets, only to have the same placeholders around it?
The problem with modern high-graphics games is the sheer amount of time it takes to model, texture, shader, animate, etc. etc. etc. every single model.
And of course, once you've done so, you end up with issues like "but all the scuff marks look the same" which games of the 1990s didn't have because there weren't enough pixels to see the scuff marks in the first place. Or complaints that the game doesn't have as many ships as FFE, when I (
definitely no 3D artist) could make a ship to FFE graphics standards in less than a day, and wouldn't get one anywhere near ED standards if you gave me a year.
We used to have a single station interior design for all orbital starports (plus the near-secret palm-tree one). It was a few years in before we got one design per economy. Not because the engine couldn't cope but because it all needed putting together and there were higher priorities early on.
Similarly Odyssey plants. There's - discounting recolours - a bit over 100 different species, most of which have multiple models for growth stages or just variety of a cluster. So that's hundreds of models which probably represent thousands of person-days of development ... to be nowhere near sufficient for people's expectations.
This isn't an engine limitation, this is a budgetary limitation: Frontier are big compared with "two programmers in an attic" independents, but not the sort of big that can afford to throw several hundred graphic artists at the problem for a year or two either like a AAA producer might. So the number of distinct assets which can exist is very limited.
(If they did at some point do an Elite 5, they might learn from this and deliberately pick an art style which doesn't require quite so much fine detail. Or they might feel that they had no choice but to go for even more detail with every ship modelled to the centimetre inside and out, and go back to the "you can fly the Cobra III" tradition for a year or two.)