Why do ground textures in new zones look worse than in the old ones?

[Namill]

Here you can see a comparison of similar ground textures from La Noscea and Kholusia

https://ibb.co/hCtWfn3

It's not just those 2 zones. It's all the zones. Could someone please explain this to me? I get that the zones are bigger now than they were in AAR, but since PS3 is no longer supported is shouldn't force the devs to lower the resolution of ground textures right? It's very weird to actually have a game experience a graphic downgrade in newer expansions.