I was always surprised that Stoneskin got entirely axed from the game a while back, but its "frosty counterpart" survived the trimming with only a modest nerf.
OA has always been a super irritating spell to actually use, despite its compelling benefits pre-nerf.
Maybe this new incarnation of it, + Regeneration Spell + Amulet of the Acrobat, might give some interesting opportunities to recoup HP while remaining stationary AND not worrying (as much) about getting ambushed by random wandering monsters who enter LOS while you are recovering from the last fight. Probably good vs. popcorn mobs, and if something truly nasty enters LOS, just retreat like normal to let Regeneration finish filling your HP reservoir.
EDIT: Ok, flavor-wise or no, I suppose I can't envision a stationary pillar of ice ducking, bobbing, weaving & rolling in any situation ...regardless of what the acrobat amulet normally does, but hey this is a fantasy computer game, so what the f$%k do I know.