Have you even played against a premade with 2 blm's and 1 whm and a war?


I have played hundreds of pug matches and have come up against 2 blms on more than 1 occasion with a whm (and have won some of these)- not sure how many times a warrior was involved.

You can not avoid "Sleep" from 3 mages sprinting with swift cast. You will not "avoid" the sleep or anything else at all


Never said it could be avoided 100% of the time (just that avoidance is best defense) and this is where the mitigation I mentioned comes in- purify, esuna, leeches, buffs.... FYI- I find your above scenario easier to manage than one BLM as they are usually casting over one another creating diminishings quite quickly and doing less damage compared to other classes due to focusing on CC.