Just gonna say I find this incredible. Doll's rejuvenation is impressive when stacked with her natural regeneration but her momentum generation is a handicap (or maybe I'm stuck in the old mindset from before they boosted momentum generation rates? Moving forward with my experience anyway).
Without hero pushing Improved Assault my Doll was always stuck between casting her single target heal, attacking for momentum, or attacking for momentum while wishing she could heal. Summing up my relationship with her momentum generation: Defender of Life doesn't act as a taunt as much as I wish it did lol. Her momentum and wasted self-regen wouldn't be the issues they were if the enemy didn't keep refusing to cooperate in beating the
out of her

Not even demoting hero to light armor and running the party inconspicuous affected her tanking rates all that much.
And that's without considering her smaller mana pool suddenly drying up, which pushes hero to emergency Blazing Aura.
Don't get me wrong, I love Doll. I really love her story too. I kept her in my party for it feels like a dozen updates.
But recently I swapped out to hero and the 3 aoe monsters and I'm happy with just how faster leveling and questing is.
I never realized how much time I spent setting up Defender, regens and spending hero turns giving her momentum and mana until I no longer had to do it.