Is the fight bullshit? Probably more towards the casual crowd who might have issues dodging and learning patterns yes, its perfectly understandable. That being said its possible to beat phaleg in under a minute with the gear we currently have so its certainly not impossible if your persistent and give it the old college try. Phaleg is a fun fight for those truly interested in a challenge.
Yes, "challenge". But really, it's just a memory game like raids in other games. Once you know the patterns, you just go through the motions. Only problem with the fight for me is that the "difficulty" comes from nothing else but seeing how many times the developers can kill the player, just like raids in other games. At least they had the decency to make it painfully obvious.
I suppose you are free to call that skill. I'd rather actually fight with a chance to win with the appropriate gear and level without lame skills like iron will from the very first try. Possible? Perhaps, but i doubt anyone has succeeded in that without foreknowledge.
To be fair though, the same can be said about every mission and mob in the game. Every single one has animations and patterns to learn, and most Boss enemies have voice lines you can learn. Even the very best players in the world aren’t going to do a mission as clean or as fast the first time, as what they would on their 100th run.