As far as the bold above, it is the opposite that is true. While having separate circuits will be best for total available current they can be a problem with ground loops if the circuit isn't designed to have the same electrical potential at each ground. This is tricky*.
On the other, hand the Torus is designed to mitigate this problem through its huge reserve of instantaneous current in the form of its stored capacitance. Think of it like water flow. You have a single supply hose into the two Torus's but they represent two big tanks that feeds the equipment. A big transient can come along and require a huge gush of water flow at once. The hose would be exhauted; but the tank can pore that flow into the amps then in the milliseconds after this the small hose can refill the tank during a time where the amps need less current for regular passages in the music.
I forgot to address this yesterday. I see now exactly what you are saying. Even though both are on the same circuit, since both have their own separate large current reserves thus more than adequately able to supply everything just fine when the gear is nicely split between the 2.