Thanks, everyone, for sharing all these cool ideas.
I guess I didn't really do a good job of specifying exactly what I was thinking. I was pondering about what other features might potentially go in an EP that also delivered weather/seasons mechanics. Even in TS4, where the packs tend to be more focused on specific themes than they usually have been in past games in the series, EPs still deliver more than one new game mechanic. So when I suggested things like farming, hobbies and supernaturals, I was thinking about game mechanics that could potentially go in a Seasons EP that have never been in a Seasons EP before. Not that a little bit of cross-compatibility between packs is necessarily a bad thing; the real problem with MFP is that you need to have C&D in order for a lot of the items in the pack to be fully functional, but if it was just one feature that players could access if they had both packs -- like @stilljustme2 mentioned the Weatherstone in Sims 3 -- that wouldn't be so bad.
