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The difference is that webusb requires the specific website allowed to interact with the USB device to be listed in a USB descriptor. What that means is that you can't replace the functionality with the same UX. So for instance Arduino can make a generally available web arduino IDE, but I can't replace that if it goes down.

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The initial WebUSB proposal included the notion of "allowed origins", but it was eventually removed in favor of user freedom.

The device can provide a landing page URL for the browser to show when the device is plugged in, but otherwise any site meeting the secure origin requirements and that has user permission can access a USB device, same as any other website.

Oh, that's great to hear. I might take another look at it then.

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