Charles plays builds like that in content. Many good players do. Not everyone needs training wheels. Except for the last 3 trials, they were all completed before Fatecarver was a thing.
I play full rotation melee range LA builds in content and it just means I have to pay attention.
Most ESO trial players don't like to pay attention. They like to chat and meme the entire raid. It's the kind of end game community you get when 99.99% of the game is super ezmode.
If one thinks Fatecarver is necessary, they are probably part of its target audience.