Increase the dps options and a casual player can keep playing the same because dps is optional there
Increase the healing required and a casual player wont be able to keep playing the same because the hps requirements are unavoidable

They are not the same and increasing the healing for the kit we have should go past "I just have to press *insert generic GCD that has no interactions with the rest of the kit* a bit more often" (which could be said the same for dps actions, I cant believe people find pressing glare and maybe handle other cds that hard yet here we are) or it wont solve anything