Oh I have no doubt it must have been a step forward in the development of hydraulics in transmissions, you need only look at the black magic box that is modern slush-automatics to see that (not to mention that fully hydraulic final drives are a mature system in military vehicles, where ungodly maintenance demands just come with the territory). Unfortunately my knowledge of anything I haven’t worked on myself (and that’s a very, very limited window of experience) comes down largely to pop-culture and meme content. I’m fairly certain Regular Car Reviews discussed a car with that transmission and what you get is more of a piss-take than a true walk through the operating principles.