It's the default now, sure. How about the 2 years the default was rk2? Imo it should automatically switch every so often, maybe as little as once per week.
As for OS - I'll admit I'm not all that involved in towers other than defending what my org has, so maybe I'm not thinking it through, but instead of doing dmg at all, why can't it just be a knockback with either a strong snare with short (10s?) duration or a mild one with longer duration, as well as either a 'defending org OS only' with faster recharge, or, as Tiamin said, a cooldown per lca? Either way would still keep people spread out without being as exploitable as current suggestions, would it not?