That chart is seriously wrong. For starters, not least of all due to the definition of "major version". And also because being stuck on one Android version is

That chart is seriously wrong. For starters, not least of all due to the definition of "major version". And also because being stuck on one Android version is not so bad since apps from the Android Market have way more control over the OS than Apple's. If the built-in WebKit is a security risk, you can download Firefox or Opera or a browser that comes with its own WebKit or whatnot, and will be able to do so forever. You can sideload it, if you're so inclined. On an iPhone 3GS, you'll be stuck with that version of WebKit forever. And ever. Until Apple shuts down their authentication servers (or 404s/times out a certain URL on their servers for that model of phone) for that phone and what you'll have then is a brick. Your iPhone will last as long as Apple chooses. And if Apple doesn't choose, they're gone and it's a brick. Either way, Apple got your money.