This guy was comparing the Bell-47 and the Robinson. That's no comparison at all.
I do fully agree on the Schweizer being the best trainer. Because I also think the Bell-47 and the Hiller are to forgiving and the transition back to modern machines is very difficult (law of primacy)
That's why I use the Schweizer for basic training and after the PPL the student can transition to the Hiller.
But you also have to remember there are still people buying Bell-47 and Hillers just to fly them privately and they would like to learn on their own machines.