You misunderstand. If healers were tuned to the level of 2s, for example, they'd be too weak to keep anything alive in 3s and 5s and everything above 2s would become DPS only, removing like 90% of the strategy involved in arena. It's not so much that it's hard, more that it has too many implications for everything else.
Also, the best way to balance 2s is to drastically increase class homogenisation, which Blizzard doesn't want. Because players would hate it.

MMO-Champion
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