I can tell you, it's entitlement. It's the natural conclusion of having a PvE game so easy, that even with 60% uptime and wrong rotation, it's possible to clear all normal content. Where improving one's own skill isn't enforced by some difficulty barrier along the way, but is dependent purely on personal motivation for improvement. With a story that casts your character constantly in an overly positive light, able to make friends with nearly everyone at every turn without having to do the actual leg work that is typically involved in fostering relationships. Add the Western, but especially American culture of hyper individualism, where only one's personal enjoyment matters at all, even (or sometimes especially) when it's to the detriments of others.
You can see it in this thread all the time. The author of a PvP guide is a "tyrant", "forcing their playstyle" upon others. The constant baseless insinuation that there isn't a "correct" way to play, which is true, if one doesn't have any kind of quality criteria to apply in the first place. It's the same argument you see when people defend single target DPS in dungeons even at lvl 60+. If you don't care about other people's time, then of course wasting other people's time isn't a misdemeanor. Seeing your teammates get obliterated by 3 people coordinating their burst (they don't even have to be premade, macros aren't rocket science to create)? Well, that's now reason to just be lethargic and not engage with the game itself anymore. Why? Because the game didn't go as this particular individual wanted their game to go (even though they are only 1 out of 72 people in the game). After all, so far, the whole game was solely about them, so why shouldn't the PvP portion of the game now not be about them as well?
I mean, take a really close look at the arguments especially from Mawlzy. They essentially boil down to "people good at this game, shouldn't play like they are good at this game". Why? Well because Mawlzy by own admission isn't really good at this game, and if others are better, that means they aren't the center of the universe anymore. It would mean that there are some things that Mawlzy could learn, that there is room for improvement, that the problem might not lie with someone else, but with Mawlzy. The people constantly complaining about being "oppressed" by premades, never give the impression that they actually have a proper understanding of the strategic intricacies of the game. My personal favorite was the statement that only "commanders" like the new Shatter map, and I would say that's true. Because Shatter is actually the most interesting map from a strategic point of view, allowing very fun and impressive plays to be made. Which you basically never see (I have seen exactly one advanced play being executed by my team in the last 2 years), because the general population of this game simply doesn't have either the knowledge or the skill the realize or execute these strategies. In fact, as you can see in Aidorouge's posts, they often times deliberately don't do something when it gets called out.