Great post! To me, a hobbies pack would be completely unecessary. They should just add more activities and skills, as they do with most packs. Combining those with the club system, we have a great hobbie experience.
I understand not everyone owns all the packs or Get Together, so a hobbies pack could be handy for them. I'd be fine with just more things to do and skills.
Like, instead of a hobbies pack, we could have bands added to the game in a Showtime time of pack, sewing could come in an elders pack, canning could come in a Farming pack etc.