Is Ortofon using a marketing ploy in forcing a body upgrade as well when changing stylus?
Yes
At the the end isn’t the stylus the most important part of analog playback above all else?
If you’re using different styli on the same cartridge body then you will definitely prefer a better stylus profile, for example Elliptical is better than Conical, but a LineContact type is much better and much more accurate with information in the record grooves than Elliptical, Connical. Then we have MicroRidge, Fritz Gyger, Van Den Hul, S.A.S. profiles if you want less record wear, longest life-span of the diamond and maximum accuracy with the music in the record grooves.
Nude diamonds are better than Bonded diamonds
Lower tip moving mass is better than higher tip mass
And then we’re coming to different Cantilevers:
Titanium is better than Aluminum, Beryllium is better than Titanium, Sapphire or Ruby. Boron can be better than all of them. We also have gemstone (Diamond Cantilever) on some exotic cartridge.
also Hollow pipe cantilevers versus Solid Rod cantilevers ...
It's all about the stylus replacement of MM/MI carts, not about the cartridge generator as you can see