Patchwerk was defined by, my group at least, as a fight with little to no mechanics that mattered that you could only lose if you didn't hit the gear check. Because, in the end, that alone decided if you continued that wing of Nax or not, if you could kill Patchwerk before his enrage hit. Now was he the hardest gear check in the world? No. But that doesn't stop the fact that he existed and flat out ended raid progression if you weren't up to snuff gear wise.
FF14 is designed, on the other hand, that if you've got the minimum item level to enter into the instance in the first place? You can beat it. It may take a lot of learning and improving, but I can only think of one instance where that statement wasn't true and that was a dev fuck up.