A serious question....

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With random mechanics, you get a bit more time to avoid and the penalty is not life or death situation.

Usually with Random mechanics, the boss has couple of sec of "charge time" and you need to have the knowledge of the attack and and animation to avoid it.

For example, many ppl might know this but in Titan HM, Mountain Buster is followed by a "swipe" animation(i save a cool down for this animation and a good healer will rdy a heal or benediction or lustrate).

Some mobs may charge different parts of the body to indicate a type of attack, if a Bull charges up the horns or similar animation, chances are a frontal attack is incoming.

Random mechanics add life to fights. I bet with Pattern mechanics, there is a chance you can create a bot for your character that will do things automatically according to mobs HP and avoid flawlessly.