Seasons and pets are the two EPs I always get super hyped about and then regret purchasing. I'm probably in the minority who feels the perma-sunny, perma-summer is better. I just hate having to worry about rain during weddings or a fun family day out unless I stop the game to cheat it all away (which kind of takes me out of the moment and defeats the purpose of having weather in the first place).
I might sit those ones out this time around, but I know it'll be hard because I bet seasons will all look GORGEOUS in this game. All of the screenshots from players are gonna be torture!