I don't believe in such a thing as an unbeatable list, with the huge diversity in codexes and armies some lists are just better suited for multiple opponents.
I guess this is an argument for comp points?
The 27 flamers and 27 screamers just "screams" cheese to me
Maybe i'm not seeing the other side of the coin, is a necron flying cricus list cheese? Sure, is an IG list with chimera/plasma spam cheese? Perhaps
I guess the difference is flamers and screamers are overpowered right now, i would hope if the daemons codex does drop in January the get nerfed... i suppose there is a chance since Matt Ward isn't writing it lol