Boss Autoattack Damage and FFXIV's Tanking Meta

[Legion88]

Alte Roite killing me with random tail slaps (not talking about the one before Twin Bolt/Clamp)
Catastrophe dropping me low enough so that I end up dying to the Dimensional Wave after the first tentacles come out
Halicarnassus doing 17k autoattacks and eventually killing me because they're hitting for 17k when I'm not mitigating

Alte Roite is fully scripted, no random abilities, no random damage income.
Catastrophe is also fully scripted with a high amount of mechanics to handle and high mechanical damage, nothing random.
Halicarnassus is designed around the tank buster Critical Hit and it seems that most of her abilities have the possibility to crit unlike that of previous bosses who can't crit outside of their autoattacks. Crit seems to be the design of herself.