If I understand you correctly, you are proposing that people constantly and strongly optimize to obtain signalling advantages. They do so without becoming directly aware of it, which further increases their efficiency.

"Efficiency" at achieving something other than what you should work towards is harmful. If it's reliable enough, let your conscious mind decide if signaling advantages or something else is what you should be optimizing. Otherwise, you let that Blind Idiot Azathoth pick your purposes for you, trusting it more than you trust yourself.