Artificial Difficulty

[Reynhart]

trial and error

Trial and Error is the most basic form of artificial difficulty.

If Icebitten and Firescorshed tooltip read "The next <debuff stack> will kill you. Cannot be applied at the same time at <other debuff>", then yes, it's real difficulty.

Another example: Marked attacks. Some of them need to be taken solo, some of them needs to be split. And you can only decide which one it is after taking it.
For the "solo" one, it rarely causes a wipe, so not a very big deal. But for the "split" one, fake difficulty. If you need to die to understand, it's fake.