If the latter, then I completely understand, and you make a valid point.
If the former, though, then my question would be why would one be content with sticking to old(er) hardware, but not be content with sticking to old(er) software?
Again, not saying you fall into that boat, but in general, anybody protesting this decision should be asked that question.
And it's a genuine question -- maybe there is a valid reason. I just can't think of one.
Security, and network effects.
Supporting deployment back to 10.6 / iOS 6 / etc isn't inherently difficult, but the fast pace of Apple's deployment, the lack of support for downgrading on iOS devices, and the now-constant API churn makes it seem like more hassle than it's worth.
Apple is intentionally driving new demand by pushing early obsolescence of old software and hardware.
For the Cintiq, or in general?
Are they necessary?
I ask because I have an Intuos Pro and haven't had a problem on Mavericks.