Just really a question I thought up since Auxiliary by definition is a backup system. Plus wouldn't allowing them to use weapons power instead of Aux help make their basic power level configs about the same things most Cruiser and Escort captains face with mainly focusing on Weapons shields and speed. I can see some taking its power from Aux like Transfer shield strength but even that could be transferred from weapons and not be based on Aux.
Just figured I'd ask. Probably wouldn't ever be changed but seems weird that something like Gravity well and other offensive moves that are science officers weapons are drawing power from a backup system or alternative system instead of some main power like your weapon's system.