I think the bigger issue is the lack of a decent difficulty curve ever since the days of 2.0.

The final dungeons had toned down versions of some of the Hard Mode primal's attacks to try and help people get to grips with what the game expected out of them and for the most part, it was actually pretty a good challenge to carry someone through this stuff back then.

I'd also argue that the Trials did a better job of being a good middle ground between the casual and hardcore aspects of the endgame back then. Again, carrying someone through Titan, Ifrit or Thordan EX wasn't particularly easy when they were new content. Compare that to most of the primals across SB and it rarely matters if someone simply can't pull their weight.

Lastly, this game is far too happy to reward people for completely unacceptable standards of play. It's standard fare to see several people with a sub 30% active rate in any given 24 man. I'm sorry but no, that's not even remotely ok at the end game.

The game doesn't need to be harder. Rather, the devs need to look at ways to encourage more people to play to a better standard so that they are better suited to take on the inevitable blips in content difficulty throughout the game.