Why, what is wrong with these "Serious Comments"?
A game is certainly played for fun & is meant to be fun, but tell me this- if we sat down and played monopoly & you rolled the dice, took your icon & moved the "wrong" way around the board, when people told you it was wrong would your reply be "But I'm playing for fun!"?

Games have a structure, a frame work in which their built upon, there's normally a defined rule set or even a set of mechanics in place that force people to play the game a certain way, to get better at a game is to learn to use & abuse said mechanics and rules to the best of your ability, take advantage if you will, for someone to imply they're going to teach others when they themselves do not fully grasp these mechanics of the game themselves is why some people took issue & they're not wrong in doing so.

You're free to play the game sub-optimally, or with one eye closed, I don't care- but don't take issue with people who are merely pointing something out, that was done wrong that could be done better, especially in a board of discussion.