I constantly get asked about this topic. That's usually a clue that there are many different teaching methods/explanations floating around. It also means that there is probably no one "exact" right answer. I agree with all of this.
So, the best I can do is give my opinions and discuss the situation in general.
It is true that 6-5 hands should "come alive." The shape alone makes the hand worth much more than its HCP.
But, the real problem is which suit