My thoughts in summary: what a difference a name makes.
iPhone runs iOS; most people don't even consider it OSX, so expectations about what apps should be there aren't based on precedence.
"Windows 8 on ARM" /sounds/ like just another platform (out of many) that Windows has been ported to. The expectation is usually based upon what the software vendor can be bothered to port, rather than what Microsoft does.
So to me it's easier to understand why people would have different expectations compared to Apple on this. Change the name and don't include any legacy UI if you want a more direct comparison to be more obvious.
IE3 was the first good browser from Microsoft, but I didn't consider it that much better. It was just good enough not to miss Netscape (much) if you made the switch.
"Good" and "Works" being relative terms, of course. YMMV, especially amongst devices in the installed base where web views aren't GPU-backed (e.g, on one common platform, that being the vast majority).
iPhone runs iOS; most people don't even consider it OSX, so expectations about what apps should be there aren't based on precedence.
"Windows 8 on ARM" /sounds/ like just another platform (out of many) that Windows has been ported to. The expectation is usually based upon what the software vendor can be bothered to port, rather than what Microsoft does.
So to me it's easier to understand why people would have different expectations compared to Apple on this. Change the name and don't include any legacy UI if you want a more direct comparison to be more obvious.