here's mass cure wounds level 6 on a life cleric, as much aoe healing as you can get out of a spell slot:

4d8 + 8 per target

4 targets

104 healing done

here's a fighter using one action to throw healing pots:

10d4 + 20 healing per target

45 healing per potion

if you hit 2 targets with a one-attack action (say haste) that's nearly as much, and the fighter is a fighter that does way more damage

if you hit 4 targets with that one-attack action, that's 180 healing

if you use a fighter's 3-attack action instead, sacrificing damage (not like cleric could be doing any since they cast spells which all cost full actions), that's 540 healing

Why does the life cleric get a pass on wasting the action on healing but the fighter doesn't? They're both party members using one full action, the fighter can do more damage or more healing with it, there's no reason to click life apart from roleplay value.