Shows you don't know what you're talking about. Most Apple OS X updates and upgrades have almost always resulted in the systems operating noticeably faster then they did before the update or upgrade. That is a fact.
Ahh I see so then the first edition of the iPad runs the present version of the Apple OS just fine?
The term is planned obsolescence and Apple has been doing it from the getgo.
Apple works just as hard as Microsoft to try and force new sales by making the new OS not compatible with the older devices. The only difference is Apple charges more.