To be able to actively swim together, splash each other with water or kiss in the water per example would be nice additions. My Zoi had a beach date and I really missed interactions like this. Also in a pool, having the pool tubes or a mattress to play or lie on together would be cute.
Edit: Just also had the idea that interactions as family would be cool. Teaching a kid how to swim to already level the swimming stat or just play with water guns or an inflatable ball in the water.
It would also be nice to be able to move around freely underwater.
This is what we need! I’d really like to see NPCs swimming on the beach or in a pool… And cooperative interactions in the water would be wonderful! I’d like to be able to send my Zoe to swim automatically, without controlling them
Amazing idea!
It would also make it easier to level swimming, when they would swim automatically!
It has finally been announced in a Brainstorm with Kjun, so this will come true now
. Fingers crossed for more interactions together
I completely %100 agree you and I think alike. We have a Sims 3 approach. 
I had started a similar topic in Brainstorm. 
