I’d argue not even 20% of the fight. Something like M Zaqul the boss timers are pretty much pointless. Knowing tentacles are coming doesn’t mean anything since you have to see where they are before they cover half the room. Blizzard has honestly done pretty good about making mechanics incredibly “obvious” in the base game. This could be super big tells (Azshara going way up in the air before arcane detonation) or by voice lines (lovers duo in Azshara for LoS or basically any boss with adds has a voice line for the spawn).