Which is a very different thing to say than "UIWebView is an older implementation". Especially when you're talking about removing something from jQuery that was meant for older versions of WebKit only to have to put it back when you discover that, shockingly, there exist browsers out there that aren't on the bleeding edge of WebKit!

Not everybody runs Chrome.

Nope, it's usually updated with every single minor and security release as well.

Only receives new features once a year. Safari (mobile or desktop) isn't exactly a model for rapid releases. It's missing a lot of stuff that Chrome has had for months, sometimes years.