> What does it do that PoE doesn't do infinitely better?

For most of its life USB was only 5 V: https://en.wikipedia.org/wiki/USB#Power

PoE is (mostly) 48 V: 
https://en.wikipedia.org/wiki/Power_over_Ethernet#Standard_implementation

PoE also requires the use of either special PoE switches or power injectors,
so at the time USB was first created it was cheaper & made more sense for PC
and laptop hardware.

Also, back then the USB folks were all like "4 different PoE standards?! That's
ridiculous!"  https://xkcd.com/927/  ;)



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