ELI5: How are the current dungeons hard?

[Exani]

They usually are the same people that only play with trusts, so that death is a full wipe instead of a raise/just keep killing the boss situation.

I actually did all the Dawntrail MSQ dungeons with Duty Support NPCs for the first time ever (since the DPS queue times were horrible). I found that running dungeons with the NPCs is a very nice way of learning mechanics. With no other players there is no lag and all the NPCs execute the mechanics "perfectly" so you can just pick one of them to follow around to find the safespot when you are unsure about a new mechanic. You also get to see more mechanics since their DPS is so bad.