I'm considering ordering a cheapie midi keyboard and, having avoided the scourge of printers, it has the first USB-B connector I've seen in at least a decade
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am I overlooking some good explanation for why USB-B exists in the first place and the connectors couldn't be symmetrical?
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USB devices are not symmetrical. USB is always a tree, and connections always go from host to device. The two sides are different at the electrical level. Connecting two of the same type is confusing at best and dangerous at worst (two hosts shorts together the 5V supplies).
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Type C made certain kinds of negotiation mandatory to solve this (e.g. it is illegal to have a Type C port that supplies power unconditionally, you *must* have a switch that checks the ID pin of whatever is connected first).
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I once had a… voice recorder, I think? that transferred data over USB, with a type-A plug, and came with an A<->A cable to do so _little_ bit frightening in retrospect
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I bought a bike light set just the other day that came with an A-A cable to charge it. And not just any A-A cable, but one with glowing USB logos on the connectors. Someone put effort into making it…
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