monono: I do not like Apple, but I dislike Adobe and their shoddy products and technology even more. Apple's reputation is multifaceted, it is not just about security, it is also about performance. Nothing will bring a mobile device (phone, video or gaming) to a crawl faster than trying to run a flash game on it while watching it eat up your batteries. The iPhone and the iPad are mobile devices.
I am not sure where you live, but here in the USA in some major cities like New York, if you have an iPhone with 3G, you usually need another phone to actually reliably make calls, because the iPhone has been locked to AT&T's shoddy 3G service, that is already overwhelmed by the bandwidth iPhones consume. These are not just phones, people use them for browsing, downloading things, playing online games, etc. It would be even worse if people could play flash based games online or browse flash based sites.
Apple's decision to block flash almost makes me want to put a Mac Mini on the list for Santa.