Yeah, but also there would be concessions made because if everyone spec’d into AoE when the group only needed half of them to… Well, half of them would have to spec into single target instead, using the Broodkeeper example. There’s bound to be some no-brainer picks for certain roles, but there’s also bound to be a lot of switch options that could go either way.
Generally, if a strategy works and gets the boss dead with that group, there’s no reason to change the strategy, hence saying that there’s no point in arguing a strategy unless the current one is failing.