The question is that of cost. Sure, there's no downside to having a smarter model, but if you have to pay orders of magnitude to use it, then it's just a waste of money. If you can get around on a bicycle then you're not gonna buy a monster truck.
You're right of course when you're talking about people. I believe there is a lot of low-hanging fruit for optimizing the performance of these models. that's actually what my startup is doing.