Been seeing a lot of doomsaying in forums/in-game lately

[Sebazy]

Casual content shouldn't prepare people for endgame. That's not its role.
Not that I don't disagree it should be tougher then it is

It shouldn't be murdering them like the endgame does, but it should at least give them an idea of what to expect IMO.

A great example of this was ARR's endgame dungeons and the way in which they snuck in baby training wheels versions of the Hardmode Primals that followed.

Meanwhile now we get dungeons where it's often best to flat out ignore the bulk of the fight and just beat the boss up. 24 man is even worse with zero reason to put in any effort or care beyond your own pride or OCD.