> I really don't get what point you're trying to make

The point I'm making with you is the strong confirmation bias (See https://en.wikipedia.org/wiki/Confirmation_bias) to your belief that there is no compelling reason to upgrade from an older PC to a tablet.

You are selectively fitting evidence (ignoring MacPros) to ensure your anecdotal argument is factually correct, then using that statement as the basis for invalidating the assertion that PC users with old hardware would benefit from "upgrading" to an iPad.

There is no reason for you who presumably has a very powerful, albeit "old", PC to upgrade to a tablet. That does not mean every other person with an old computer will also not benefit from replacing their machine with a tablet. The latter part being the basis for the statement from Apple.

My opinion: for folks who don't require KVM, could upgrade to a tablet. Anecdotally, my Mom no longer uses her laptop, and does her emailing, youtubing, and photo stuff wholly on a 1st gen ipad. However, her use case is clearly not yours (or mine).