The thing is, the default sceneries will only include two kinds of buildings:
- the "photogrametry" buildings, made from extrapolation of the aerial pictures of special types
- the "autogen", made of generic buildings placed accurately on top of the photorealistic ground textures, anywhere photogrametry is not available.
Both of these will look very good... but only from a certain distance.
In the case of photogrametry buildings, things could get a bit ugly when viewed from very close.
In the case of generic buildings, well... they are generic.
So in both cases, there is room for a good OrbX-style airport scenery with accurate 3D buildings that would be beautiful even from very close distance (think about hangars, jetways etc...).
But yes, sceneries based on landclass are probably not going to happen in FS2020... and that's not a bad thing