I thought it was something new.....
You can make just about any three wire into a one wire by hooking in a jumper wire (I've never had to use a diode). In a true one wire this is done internally.
Once a one wire receives enough output from the charge lug to excite the field it will start putting out juice and to my knowledge will continue to produce juice until the alt stops spinning. The difference is...… you need higher RPMs initially to get the alt to start producing juice, once it starts producing it works about the same as a three wire.
IMO the drawback is...…. the sense wire is taking the reading from the charge lug, which isn't the ideal place to get a sense of the demand/draw on the electrical system. The three wire OEM setup allows the sense wire gets it's reading further down the line and a truer demand/draw on the electrical system.
Both work just fine.