Why does battle high exist?

[KageTokage]

Wins should be decided by a team's overall performance throughout a game and the snowballing momentum from battle high really does not encourage that to happen because it becomes a crutch with how much easier it makes it kill enemies/keep your team alive.

Losing more points from dying with it scarcely counts as a disadvantage with how easy it is to just hang back and avoid making yourself an easy target.

I think it would be more balanced if you needed to keep getting kills/assists periodically to maintain the buff instead of it lasting until death or toning down the buff somehow. In its current state I don't feel like it accomplishes anything other then making games end faster but I'd rather have a longer game where making a comeback is actually a realistic prospect. Few things are more frustrating then the battle high team basically trolling by letting you get a lead while they farm the other team, then deciding to just steamroll you in the last moments. Heck, even when my team is the one with the highs I don't feel like it's making things more enjoyable (Outside of the inherent joy of winning the match, of course).