Yes yes. I agree,

Bosses should call out ahead of time what they're going to do and how to deal with the mechanic.

Likem Nael can call out "MWAHAHAHAHA, IF THOSE TWO METEORS TOUCH, IT'S ALL OVER!" and in t13 bahamut can say "GRAAAAAAAAAAAAW, THIS SPACE LASER WILL KILL MAIN TANK IF NOBODY SHARES THE DAMAGE!"