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1. Tech support would be much much much easier because now a person's entire hardware profile is known. Potentially this could be extended to software as well.
2. And this is the brilliant bit: this gives everyone real-time number of what platforms are being used, by whom and where.
The second thing was spawned when I got an Android phone to replace my iPhone. I found myself suddenly writing emails to every app maker and hardware manufacturer requesting they support Android. With this system in place, such requests would be moot as now companies can see exactly how big of a market a particular device commands.