I agree with you synchronized explosions is a big advantage of multiboxers, but in BGs I think the biggest advantage is that you have focused fire. Many single players assisting one leader would be better in BGs for the most part, but instead you have lots of independent players killing different targets which isn't ideal.
Regarding dual healers, I guess it depends if you think there are enough healers in BGs. I know that when I go against a team that has lots of healers, who are actually healing and not trying to kill, we lose badly. Bringing two dedicated healers can impact the DPS/healing ratio and be a big help.
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