I can see Auto-Protect being a thing, but not Auto-Stoneskin. Protect is always there until the timer on it runs out. Stoneskin, once you take a certain amount of damage through Stoneskin, that's literally it. The buff goes away before the 30 minute timer on it is up.

Though, and I know this is the wrong place for it, but why don't we have access to Shell either? That'd be kinda useful against magical enemies.