Do the Legacy Servers Have an Elitism Problem?

[Neophyte]

They're not required, if they're not apart of the base toolkit they are not required to play the class.

That's plain wrong. You can't do Niddhog Ex or Sophia Ex (properly) without tanks having provoce. So unless you go with 2xPLD the other tank (WAR/DRK) has to have provoce unlocked. Else fail, there is no reason to even try without it. Go lvl PLD fast.
[That is... you can also do Sophia with "tankswapping" by "MT dies, OT was 2nd in emnity and tanks now, rezz and repeat with reversed roles".. but... really?!]

All they do is make it easier, having X skill open for cross class isn't a determining factor in whether or not someone should be excluded from content. Stating it is a requirement is exactly what that post is calling out into question.

If all your dps in the Group would share that opinion you likely wouldn't see half as much clears as you've seen (ok, less likely on Sophia, but on Niddhog for sure). Caster without Raging Strikes and melee/ranged without B4B/Internal Release/Invigorate, MCH without Hawk's Eye, Healers without Swiftcast, tanks without provoce... welcome to a fail group of lazy players?

Also your argument would also apply to "Jobs". They're "optional" (i.e. not needed for queuing and clearing content) and "only" unlock skills which make it easier to get the job done. You can even wear almost every gear except the relic I think, so.... ? (Hint: You will get kicked without a job, too.)

It's true that you can still beat content with subpar skills/toolkit. But some players doesn't care to carry special snowflakes, who don't realize that up to 7 other people have to compensate for their lacks.