Because that’s how pugging works. Your group will never be consistent, and pugs won’t stick around no matter how much you plead with them.
So you have to be able to leave your group and join another, or invite people who already did some progression. Imagine how many fewer people would have AOTC if it had the same unique instance ID lockout.
I wonder how far pugs would get if they were free to try it as much as they wanted. People pug 16s after all, so there are some extremely skilled pug players. I imagine some people in the world could pug a full mythic clear, especially if they already have earned CE (which would probably be the requirement to get in, knowing pugs). And really good responsibility-assigning weakauras would be made for pugs I imagine.
Not exactly; Blizzard has continued to push the envelope on encounter design as the playerbase has gotten better at the game. Somebody like Mythic Klaxxi or Garrosh (referring to them after the rename, for clarity) would be a mid-range boss in Mythic Sepulcher, for example.
I wonder, did heroic raids in MOP have the same pull counts on progression as the mythic endgame bosses do nowadays? I hear people do 100+ pulls on some bosses, sometimes 400.
So, you used to pug the hardest raid difficulty in MoP (despite your achievements not showing that), even with raid ID lockouts, but now pugging with raid ID lockouts doesn’t work?
Ignoring of course the arms race in player skill vs encounter difficulty over the last decade since then.