If SE made it so the difficulty of the content (leveling, normal dungeons etc) would gradually increase as the player levels up, then people would probably not have as much trouble clearing this fight as they are right now. Expecting players to experience very easy content then dropping something that is near extreme trial type of content, will only result in what we have right now.

I dont think they should nerf it, but for the next expansion, I would advice SE to either increase the difficulty as the player levels up or keep the difficulty the same, what they did with Stormblood was not smart.