I wonder if bringing back cleric stance would still be overpowered now. Granted in one on one scenarios the healer would be overpowered but this is frontlines we are talking about so thats pretty moot (warrior is overpowered one on one too and nobody cares). Part of the reason it used to be overpowered before was the medica 2/regen stacking as well as the ability to lustrate in cleric stance with no penalty to its cure potency but both of those things are gone now.

The healer would have to make conscious decisions about what stance to be in now, unlike pre medica 2/regen/lustrate nerf, as what stance they are in could cost them the lives of teammates even more so than before. And the dps they are putting out in cleric stance isnt worth the death of a dps that can deal substantially greater dmg in a shorter amount of time. They could always tinker with the recast too to further inhibit freely switching back and forth and force them to commit more.

Either way I dont really see how a party of healers could survive in cleric stance like they used to before especially with practically every job getting an increase to their burst potential since the days of secure (obviously some more than others). Some of those healers would be forced out of cleric stance and those that remain in it would be doing subpar dps dmg anyway with practically no burst power. Only thing that would worry me is a party of healers going around trading Divine breaths with one another to indefinitely prolongue skirmishes like they used to in secure. But unlike in secure, those deaths would hurt your teams score in seize so idk maybe that tactic wouldnt be so viable here anymore.