So ... #Tankstrike?
I think the moral is you can do content with any comp you like. That should be a good thing. Just that fights are designed for the majority to be 2 tanks 2 healers 4 DPS. (You) As a player don't have to follow that rule if you don't want to.
While I myself may not be competent enough to do this content just yet I find the freedom to experiment on what is possible a good thing.
I've only seen this as something that should be considered a problem if it's adopted by a majority of the player base. I don't think no healers or no tanks is easier or superior.
Generally speaking coming from WoW there have been times where as an example one class is just so completely useless or is in such a terrible state you may as well not play that class because you won't get invited.
I'm not watching a tankless run or a healerless run and going "Yeah I can do that - this is the new norm" I don't find this as trivializing content I find it as interesting challenges or ways statics can approach things their own way in unorthodox ways.
It is funny though.
Now all we need is a DPSless run. So we can be full circle.