Why would the cutting device be deliberately at a different angle than the playback device?

Lack of ISO standard for tone arm pivot location or arm length? Harder to build a cutter that pivots or moves at a variable angle? The general notion that cutting and playback were "good enough"? Other ideas?

I have to say that while I enjoyed watching that Rabco work, I could not detect an audible difference over the original AR turntable tone arm that it replaced. Not enough of a stereophile, me.