Thanks for the answer - I fully appreciate what you say. I'm just a bitter iPad1 owner whose £400 toy became obsolete barely a year after purchase. It's a shame there isn't a native equivalent of progressive enhancement.
To be fair the iPad shipped with iOS 3.2 and has seen upgrades through 4.x and 5.x. My iPad 1 from 2010 saw a good few years of use, rather than just barely a year.