that concept pretty much describes how a 240 vac circuit works. with one exception, the circuit breaker(s) feeding that circuit, must be ganged so that if one trips, they both trip.I can go along with how bad it is.
Awhile back there was a magic wiring device for sale. The device could convert two 115 volt circuits into a single 230 Volt circuit. It was something like $90 plus shipping.
The device was a simple three headed cable. Two 115 plugs and one 230 socket. The only catch for it to work is one plug had to be plugged into the black side and the other into the red side from the main line. (I don't know what to call the sides of the line as it definitely isn't Phase.) legs
Thankfully the device is no longer on the market. Yes, I know that it "would" work but if you popped one of the breakers the remaining one would still be providing a lethally potent bit of electricity into the machine.
Hopefully nobody here is using the device.