I understand the wish for snow but can we please stop assuming rude things like "the devs didn't want to deal with it". There is no reason to automatically assume the choice was because something was "too difficult".
Also, Lake Lunvik in Moonwood Mill doesn't freeze in winter. It says "too cold to swim" but it's not frozen. Werewolves can still wade in up to their ankles.
I personally like the Autumnal feel of the new world, it seems fitting. It's just the leaves that are starting to bother me. My Sim is constantly sweeping them up as she's on a large lot.
Edit: so I found the leaves eventually vanished if I restarted my game. So they mustn't be intended to continue into Spring and Summer after all. I'm relieved about that because Whispering Glen is such a beautiful neighbourhood.
I Live on the largest lot and have yet to see a single fallen leave. It is currently winter so should have seen some by now if there are any.
