Why does battle high exist?

[NessaWyvern]

When one team as battle highs, that's when the other two need to sandwich them.

This doesn't happen though, as for some reason, the other losing team likes to hit the one that's being farmed, rather than the battle highs.

Also battle highs tend to only happen if you don't focus down the healers, as dps need healing to not die so they can get the consecutive kills needed to get battle highs.