Just going on how the cars drive now, what has surprised me most is how little braking I actually have to do.
There used to be a lovely progressive, ratcheting-down trail-brake phase. Now it feels much more focused on holding a fairly linear partial brake until the speed/state you want is reached, then releasing and letting the car rotate.
Couple that with the revised diff behaviour, the general move towards more stable/power-understeer-biased setups, and the explicitly “family accessible” direction of the upcoming modes, and I don’t think it’s a huge leap to see a coherent philosophy emerging.
I’m not saying the physics changes were made specifically for Family Mode, but they do seem to be making the cars easier to read and manage without simply giving them more grip.