If a long winded telegraph from the boss including a castbar is "too convoluted", then there is nothing left for mechanics but "don't stand in the orange". And the "split second telegraphs" aren't intended to be dodged, they are there to show where the unsafe spot is post-facto. If content can be cleared by someone equivalent to "no knowledge" despite being at endgame content, it simply has no difficulty. Might as well watch the game on youtube at that point.
"I didn't pay attention to the fight and died" sounds like a reasonable and good thing for a combat encounter in an action combat MMORPG. The fact that paying attention to a game while playing said game is constructed as some kind of herculean feat instead of being the absolute basic requirement is certainly a take. Again, might as well watch the game on youtube, that way you can watch something more interesting on the 2nd monitor, without impacting the experience of other people like many currently are doing, especially in Alliance Raids.