I think what Melrose was talking about is the confusion of what devices will be able to support a new OS. For example, when iOS 4.3 is released, it is pretty certain that the iPhone 4 will support it. However, when Gingerbread was released there was delays getting the update out through the various carriers.
That is just my point. Android devices can be so tailored to a specific handset that if/when a fancier master version/update is released by Google, it may not work on your device -
even if your device is brand spanking new.
I'm trying to be subjective, but apparently that's not enough for a select few Android lovers. I'm simply pointing out that open-source software (Android, in this case) forks and branches whereas a closed system offers an inherently better experience. It is perfectly capable of creating as many problems as it solves because every handset maker and his brother is tinkering around with it, each, sadly, trying to give it some proprietary feature or spiffy look that the competition
doesn't have (resulting in not only market saturation of a million and one different looks and features but a million and one different versions of the OS, enough to confuse most of your average buyers and making it like early browser wars all over again). That's not to say some Android devices aren't splashy and functional, but they're still based on a system that may not support the latest version of it's own operating system without some patience waiting for the handset manufacturer; You can't just go to Google HQ and download it and it runs blemish-free.
You use what works for you..
edit..
Not to mention, if/when problems arise, who do you call? Google is notoriously horrible on customer service, and the handset manufacturers aren't the ones who made the OS so they won't be able to resolve every problem that comes up. It plagues Windows users to this day: Problem w/ Computer. Call Dell. Dell Says Call Microsoft. Microsoft Says Call Dell. It confuses the hell out of people are not über-obsessed tech geeks like us. There's always the question of
Will it Work? that Apple completely removes form the picture. You got a new iPhone? Great. It works.