Jenoss, Archbishop Teresa doesn't actually provide consistent heals, it's still based on a 75% chance on others getting hit for it to trigger. On some occasions if you're not lucky it may not trigger at all. Her greatest weakness lies in getting hit only on herself which won't trigger any heals for anyone. From what I see, Archbishop Lucille's aura trumps both Inquisitor and Archbishop Teresa. You also need to take into account Lucille has far superior stats compared to a normal hero, which makes her heals all the more potent.
For Archbishop Lucille, you cannot have the best of both worlds, her aura now is by far one of the most overpowered passives in the game. Already coupled with low CD, 2-turn immunity and cleanse effect, if you want to add any more it would simply be game breaking. I believe with such a high modifier for a single heal, it would very much suit a Guardian since they are the ones getting most of the heat in PVE with taunt. Her skill still has its benefits in arena, with a shorter CD she can cover your Guardian/Ninja who is occupying the center tile with haste. A newly swapped Ninja who occupies the center tile can have 4 turn immunity from most attacks which can already guarantee you closer to victory. She is not useless, you are simply not making full use of her.
Only using the example of doing the halloween event, i can show you proves that i can sustain almost the double of the time using a teresa rather than a lucille. And it's not about luck or not, in the same turns Teresa heal a lot more than a lucille with her passive aura in my games.
I never said devs should buff her active skill, i always said they should "rework it", because right now, is by miles more usefull a mass heal active skill rather than something you may use few times and only if you have the right occasion and the right unit to use for.
When i have to choose between teresa to lucille, i always use teresa, because she is more versitile (support should be like this) and don't focus only to make stay alive one units, and make lose all the other ones in the same time.
In pvp prospective, right now i'm expert 3, some weeks i go more up depending how much time i put into the game, and i have a 95% win ratio.
Dev can easly notice that on my games, i ALMOST NEVER use lucille active skill, because if i have to choose between mass kill the enemy or make one unit resist 2 turns and in the meanwhile lose all the other ones, because i don't CC enemyes or knockback them position etc etc..
Same thing i can say in pve.
I can make one unit be invincible for 2 turns, but even if it's a tank with a taunt, it will make everything for the worse, i will lose more fast all my team without a mass heal / shield to my party.
I see this active skill like a lack of prospective to the real ingame needs, on a tactics purpose.
They could make this skill less powerfull but buffing and healing 3 target in a row, and it would be a lot more nice and interesting even on a tactics side..