I never took it as a criticism of my post, so no need to be sorry. And you are most definitely right that RF can be implemented in different ways and the way it is implemented on the 800 is the most versatile.
The MX-600 is the least (just repeater and IR is always on)
then you have the Prontos (routing only with what RF base is used)
then you have the MX-800 (routing to the port)
so if you do need port routing then the MX-800 is the best (as far as routing is concerned)
(but it was 3 am and did not feel like getting into the details

that is why I did say that the differences were RF related and not just RF