Steak is normally not ground, unlike roasted coffee beans. So there is no mixing. On the other hand, I know at least one coffee company that sells a mix of dark and light ground coffee (Melitta, in the US).
If you were to blend the entire steak together, would you notice?
Yes, it would taste like a mix of rare steak and ruined steak
I think it would. It's not like a piece of charred meat 'cancels out' a piece of cold, uncooked meat. If you were flavoring a batch of yoghurt, and 1/4 of it has 10% too much, and 1/4 10% too little, then yes. But for processes where the not-measured characteristics of the elements on the left side of the curve are different than those on the right, no.