Heal parses for clerics are often a measure of who is bad. For a ch chain, the longer you jerk off before pressing your button, the more time for the tank to take damage, so the higher your gross heal parse tends to be. Later on, its slightly better, but since renewal and hots arent reflected it kinda misses clerics who are proactive and anticipate damage in favor of measuring purely reactive healing. Then you get to splash and paladins take huge shits on everyone else on heal parsing.
A good cleric = everyone around them can self-actualize without sweating spike damage.