In truth that encounter was also designed by the same developers who designed the mechanics to accomodate 2 tanks.
With that in mind you can't really label it elitism when everyone was running a 1 tank set up specifically for the purpose of bringing some extra dps to skip that mechanic.
It wasnt expecting the 4 damage dealers to step up there game and perform above and beyond the minimum required of them.
It was taking a 5th damage dealer in place of a second tank to do the extra damage required to skip that mechanic.
That being said taking 5 damage dealers and throwing criticism when they only do the damage of 4 damage dealers isn't elitism it's fair critisism.
Even the average Joes were throwing up party finders with a 1 tank set up, it wasn't just the top tier players. The laughable thing about that fight is because every PF group was running 1 tank setups and as such there were a ton of tanks who weren't able to get groups, Which then led to parties of 6 tanks and 2 healers skipping soar mechanics when parties of 5 dps jobs couldn't... That's why its such a meme...
Ironically it's usually the "bad" (insert better choice of word) players whose self esteem often depends on video games. This is where the sentiment of escapism stems from. People who are lazy, depressed, lonely or feel they can't accomplish anything in there life often escape to video games as a means of finding self esteem.. This is why they often complain about elitism, gatekepping, tryhards.. and a bunch of other terms.
In comparison a lot of the better players (again terrible word choice) play video games to supplement life not escape from it. They hold jobs, families, lives, and still make time to take on the various challenges video games throw at them...
Where as the players who use games as escapism are often the entitled ones. who whine when they can't get that shiny that someone else has so cry for it to be made easier and handed to them on a silver platter. They complain about gate keeping and other such stuff when in reality the only one blocking there path is themselves. No-one is blocking you from entering a piece of content and getting that reward because they dont want you to have it, so there is no gatekeeping or elitism.. Hell they'd probably pat you on the back and say good job if you did take it on and smash it instead of saying "NO you can't have this..."
This is what kills a lot of the content in the game. The way all the rewards and trophies lose all there value and significance because people feel entitled to the same rewards but with none of the effort... It's not about how many people have x trophy or x item. Its about what it represents generally.
I'm far from a top end player these days so iIm definitly not an elitist. I smashed Coil In ARR, dabbled with Alexander in HW. by SB my raiding was basically slot filler for a couple of friends so I have a few clears but sporadic. Omega 1 2, 6, 7, 10 I think? and I've never set foot in eden savage because there's just no real motivation to do so when they keep nerfing everything...
In my mind it's like busting ya ass off in the 500m to win a gold medal. and then find everyone got one at the finish line... You could have walked and still got one (kinda destroys the significance or value.)