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@hailey Now all the devices on a given controller kind of look like a LAN with automatically enumerated endpoint and device IDs. The USB controller doesn't REALLY care about all the devices its speaking to, it's just given a set of transfers to do to endpoints and when it issues the transfers it hopes to heck they're there.

But like, when you plug in hubs, those are store and forward things. And these days doing USB2 or USB1 on a USB-3 port can actually end up with a "hub" doing translation!