You start your argument with "but" which gives me no desire to listen to anything else you say. Rhetorically you might as well have said "I'm not a <bigot> but..." Your argument carries as much value as that at this point.
Then there's also the fact that what you say can easily be replaced with talking about M+ dungeons as they are as large a part of this game. I see plenty of people in high keys M+ who have no ideas what any of the mechanics do and/or how the Affixes affect them. In SotS I've seen many tanks engage and keep the elemental before the second boss in the middle of the bridge twice on Fortified weeks on +15. Or keeping the first two bosses in ToS together on Tyrannical weeks, even worse on the Grievous week as it makes the ring of death impossible to jump over. The fact that you can even jump over the ring. Etc.
People should have learned what these things do and how they work when there's no consequence to failing, as in the Mythic version. Being surprised at high keys is just wasting the time of four other people.