Those kinds of things are all examples of what we did when my guild was progging through Mythic raids.
We go through logs, check timings of things dying, phases changing etc. - That all requires intentional thought and reacting to many variables.
The decisions aren’t no-brainers - not at the beginning when we first try out our plan A, and not throughout progression as we switch to Plan B, C, etc.
Looking at your limited experience - I could see why you’d think the process is very simple. Your performance is fairly average - so it doesn’t seem like you take much time to think at a personal level, let alone at a raid level.
Your M+ experience is also very limited - and if I had to bet money, I’d say you paid for the carry on your +15 Temple; running with a bunch of 475 ilvl players when you’re at 446.
Seems odd for a player like yourself to be commenting on the higher level difficulties of gameplay, strategy, and thinking WoW has to offer when you can barely manage to do the mid level difficulties very well and have to resort to carries to get you a decent weekly chest.
I’m really sorry for whatever/whoever hurt you - seems like you’re just trying to proliferate whatever kind of anger and hatred you were exposed to.