But orientation changes? Is that not a general "mobile issue" for you? Or is (are) the WebKit build(s) in iOS doing something specifically bad compared to (say) Android?
Not "right now". As long as you intend to support "retina displays", it will always be an Apple-specific thing.
If you want to support something as general as high-DPI devices, you know, something concrete and not an Apple marketing-term, there are certainly lots of those being made and sold as we speak. They run Android and are not made by Apple.
You might want to consider supporting those as well.
But I'm guessing that Android phones with high-dpi screens that support that query are still at the single digit percentage of browser statistics.
(Possibly interesting idea: add some analytics so that you can detect portrait/landscape orientation changes, and report on bounce rates immediately afterwards…)
For example, all mobile web browsers should theoretically throw either a resize or orientationchange event on orientation change, but some Android devices don't, with no other viable fallback, and no clear rhyme or reason as to which devices support it and which don't (other than that newer flagship devices are slightly more likely to be standards-compliant). CSS media queries are more consistently supported, but they aren't the solution to every problem.
