Three
Tour Rookie
A bit like comparing a Dacia to a Merc S class. Both will get me from A to B but the Merc will do it quicker, more comfortably and more safely. If Mercedes are just 'getting me to pay more' then I'm happy to be ripped off.
That's a poor comparison.
There are tangible differences in performance, quality of components which is measurable based on reliability, durability and precision repetition. The safety measures that you allude to are also measurable.
Your measure of a "better" shaft seems to be based just on price.