Flash is necessary because a lot of websites use it, not only for embedded media, but also for menu bars and links - so if you don't have flash support, you can't navigate the site. Also, many sites/forums I go to embed youtube video in the page, which doesn't work without flash. And the Apple "youtube" browser does not take you to www.youtube.com, but rather an alternate site for mobile devices which doesn't have the same media as the www site (I couldn't find videos I had uploaded on youtube.com using the touch).

I understand why you disable flash in your mobile browsing device, and I use a script blocker on my pc at home as well, but at least I have the option of enabling flash (and setting permissions for certain sites) when I need it to view a site properly.