I see a lot of wipes, even in easy 4-player dungeons, because the healer was too busy dealing damage to enemies...

A healer that let the party dies because he/she "was too busy doing damage" is always a bad healer, even if he/she is able to squeeze high dps.

The primary function of a healer is to keep the party alive, using buffs and removing debuffs. DPS is a secondary function.

When I play as healer, I attack the enemies whenever as possible, but keeping the party alive (and buffed) is my top priority.