Amazon may not be the best example
In terms of fragmentation, Amazon is probably the only company to do it right. When they took Google's Android and modified it, they didn't keep claiming it was Google Android. They represent the device as Kindle Fire not Kindle Fire Android Tablet. They provided there own repositories for updates, add-on applications and content rather than piggy-backing on Google's repositories.
In other similar OS circles, this is clearly a child fork properly seporated from the parent distribution rather than a modified version represented as the original.
I do agree with fragmentation in general though. Too many vendors shipping a modified one-off product claiming to be the original. Too many devices shipping with out of date software. An older major version is fine provided it continues to get updates; this is not the case with devices shipping older major versions that will never get patches let alone updated firmware versions.
At least the Nexus devices get stock Android and prompt updates even when they don't get major version upgrades. Outside of the Nexus line and one vendor who truly differentiated by going it alone when they shipped a child fork; the OS is a mess.
