Different game, same thing every time. Very top end of difficulty is always going to require a pre-made group setup and geared properly to beat. You're generally not going to get it with pugs and this is was meant as a final challenge. If you can't do it, too bad. Not everyone beats the highest difficulty in every game. IF you really want to do it, find a "private" group that wants to really push and work on it.
As for solo stuff. There is plenty to do solo and has been for a while now. Gotta remember this is a mmo. It's multiplayer. The majority of the content is going to be for multiple players. Don't like it? go play an offline rpg or something else. There's tons of solo games out there, not every game is going to pander to you. It's a fact of life, enjoy what solo content there is if that's you're thing but stop expecting a multiplayer game to offer solo stuff for everything.