Yes, it does. Because HP cannot be healed beyond 100%, so there is waste in any healing you throw out that goes beyond that. This is wasting a GCD on a pointless heal, and you are trying to justify this by arbitrarily attaching mana regeneration to this overheal/“healing stance”. As I said in my previous response to you, your entire system is a non-functional “healing for the sake of healing” system that will not work with the encounter design of this game. Not to mention, it is a very gatekeeping system that I can guarantee healer mains would not like or appreciate. I know I don’t want to be arbitrarily gatekeeped from dealing damage because you want to force meaningless healing on the healers. Versus actually giving us meaningful gameplay.
A heal that heals nothing means nothing. It is a waste of a GCD, and a wasteful contribution to a party. I prefer to actively contribute. Not burden. And I think a lot of the healer mains posting in this thread feel much the same. Healers don’t want to waste GCDs. They would rather contribute meaningfully to a party, and healing nothing is not a meaningful contribution.
Unless this damage increase is enough to make up for each pointless GCD you have to waste on overheal, it would still be a net loss.Alternatively, add a bonus to overhealing, so if you overheal, you'll get some bonus to damage the next time you deal damage, but with some limitation and caps so people don't just overheal infinitely to only cast one DPS spell near the end.
Why do you think current Afflatus Misery is a damage loss? Because the GCDs spent on Solace or Rapture to build up to it do not offset the three Glare IIIs that you have to lose in order to get your blood lily—unless you are building up to Misery during downtime and not losing out on Glare III casts at all. This same thing applies to SGE’s Toxikon: because it is the same potency as Dosis III, it is a better use of your GCD to just cast Dosis III and heal with an oGCD Addersgall stack versus casting E. Diagnosis to absorb damage and farm Toxikon stacks. The only time you farm for them is during downtime.
You would need to multiply the base potency by the number of forced healing GCDs in order to make this a gain.
You said that you were a non-healer, and no offense, but it shows.