It's not either-or. The Sims team could easily split their time between adding to representation and adding to gameplay. Representation is an important issue among the younger crowd, and honestly, I think that's a good thing. It would be boring if every Sim were the same. But in spending so much time promoting it, they're coming across as desperate for approval.
It reminds me of those commercials that try to be funny or "hip." I don't need any of that! Just calmly explain to me what the product does, and I'll decide whether I want it or not! If the Sims team did that re: diversity and representation, instead of going on and on about it, I think that would please a lot more of the fanbase than it is right now.