Who might those people be? It's not us. We all think we know something, understand something, act and talk like we know everything - we don't. Sure, we can make some pretty good guesses, but there's still plenty about the game we don't know, don't understand. There are many parts of much bigger pictures we simply cannot see until they're shown to us, and they can't be shown to us until they're developed.
Certainly though, it can only benefit development to take input from us - just don't take us at our word, because we're talking out of our bums most of the time.
There are a number of people here who, for example, understand combat balance far better than FD does. In the past FD frequently did listen to them when they explained why the stats they presented didn't lead to the gameplay they aimed for. You could do that before releasing it though. I am not talking about 'should we go for spacelegs or atmos?' but rather 'suppose we would increase the fire rate of this weapon to that value, what would happen?'.