Although you tempt me to continue a horrible analogy, this is about open-mindedness. If somone has the mindset of 'I want to DPS' sure, you tell them roll something else, but if someone has the mindset of 'I want to be an archer', you would in fact be best serving them (after the overall warning) by helping to show that you really REALLY need to maximize your DPS in every little way and play intelligently to even come close to being effective.
Not everyone has been playing for years and only drags themselves through again and again to see bigger numbers on subscreens. Some of us actually still enjoy the act of playing various characters, rather then simply drawing satisfaction from faster completions or reduction in tactics/difficulty.