Idea for Sims 4 cats and dogs

I think the reason why they didn't make them controllable is the fact people who wanted a challenging and unpredictable gameplay in Sims 3 pets, didn't have a chance. Sims 3 have them the power to not to control the pets, but seeing those pets are completely playable, most of the actions depends on the player, Some actions aren't doable by pets without the players command, so with that case they still have to play with them, loosing challenge. People who want unpredictable gameplay didn't get a fleshed out behavior like Sims 2 did, seeing the development time focused on making them controllable. So if they do both, People who want challenge will be left in the dust like what sims 3 did IMO, so what the devs do is to focus on behaviors of pets to make them more believable, spontaneous, and lifelike, and to exceed on what Sims 2 did on that part, they have to cut playable pets.