Pet energy regen

Pet energy regen - does it actually do anything? As near as i can tell they don’t even use energy, or at least not enough to matter, so why have this stat? Especially on Bonds of Bysmiel.

Pets use energy for certain skills (the hellhound, briarthorn, and raven have other skills you can put skill points into that use energy), but the only one that ever uses energy more than it regens seems to be a low level raven with high level mend in a situation where you and your pets are taking constant damage. I’ve seen my raven run out of energy in those situations, but even then that was only at low levels and was extremely rare.