DESTROYED WINTER: Snow is flat, no depth. Snow looks like white paint on the roofs.

I think it is more a case of everyone rejoice that Seasons is coming and that Seasons seems to be jam-packed with tons of stuff.

We can quibble over the realism of snow.

Theoretically, we can add snow drift/build-up via modded geometry - ie static - ie you'd have to keep swapping it.

TS3 had snow angels, but those were geometry introduced into the world, then removed. It wasn't some kind of real-time depth effect - it was a mesh.