You're forgetting one thing though.
Using helicoid focussing does not necessarily also mean internal focussing. Most helicoid focussing lenses (those made by Zeiss for Hassselblad too) use unit focussing, just like RB/RZ lenses. No difference.

You're forgetting one other thing too.
When moving the entire lens, to change focus from near to far (or vice versa), you do not have an opportunity to change correction. Using internal (or group) focussing (or at least a floating element or group, whether used for focussing or not), you do.
So your "old school" bellows focussed lenses actually do suffer more from having to choose between near or infinity optimisation. Just because the elements are fixed.

Though you were correct in the beginning of your post, in the end you got it entirely backwards.