I would like to see more interaction with the hospitals, operations & births. People having broken legs set in plaster. Our Sims could trip and fall and need hospital treatment- as they never seem to fall over. And if they were like me they would be so uncoordinated.
I would also like to see more differences in the height of Sims, as they all seem to be the same height.
I loved the Pianos too. I also loved the changing seasons with all the gardening and sale of veg.
I would like to see the new career as ballet dancers-they could do barre exercises and have a dance studio in their home and take their grade exams to get to the height of the profession culminating in becoming a professional dancer. And we could have actors, they could learn their lines and quote from Hamlet in Simlish, they could buy the scripts from the bookshop.