There's a difference in qualifications between a group in the 0.01% and 95+ percentile with a full mythic clear and a group who has only cleared heroic and is attempting mythic but can't do more than 2-3 bosses before the entire tier is up, no? If the latter said "mythic is easy, it's just hitting buttons in a certain order and killing the boss" but they can't actually clear mythic what would be the point in asking what they mean? I wouldn't bother, honestly. Now maybe the latter group finds a better way of doing boss 6, even though they can't clear it, that is entirely different than this situation IMO. Something like "Well, it's easy because you can soak x mechanic with x class and cheese it." would be worth discussing, yes even if a group hadn't cleared it. Oversimplification and ignoring all nuance is not something worth discussing to me.
Just like if I said tournament tennis is easy it's literally hitting a ball with a racket and i'm low ranked with no championships or ever even participated in a tournament I would look like a tool. I'm definitely less likely to take tips/feedback from someone if they believe something like that. But If I notice a basic/intermediate error that someone of even lower rank can notice, and I let the higher ranked player know, that is sort of different.