This is sort’ve true but post processing isn’t where the game struggles per se. Both Skyrim and Fallout 4 lacked LOD lighting and featured prominent Z-fighting of many textures, that’s an inherent way that the LODs are calculated in the engine.
So most of what I’m talking about like lackluster quest design and poor visuals aren’t unfixable by the engine, but they’re direct results of developing using it. The quest structures are mostly the same as they have been for decades.
And yes, they could easily code something like an ENB mod but they just don’t. They’re so bad at this in fact that they can’t even get proper anti-aliasing working. If I remember right, Fallout used TAA and it was so awful that I preferred a 3rd party FXAA to their solution.
Also to be fair, ENB is similar to other graphics injectors which aren’t new on the block but you dont really want to use an injector so they’d have to code something like an ENB into their DLL and that would affect the engine so they don’t do it. It needs a big update to add stuff like that and this will be the third game they haven’t bothered to significantly change it.