If someone's excited about notifications for USB devices, let them first go solve the case that's agreed to be a problem, which is when a user plugs in their USB Foobaz, and Linux doesn't have a suitable driver. udev (with perhaps a small tweak to the kernel) can figure out that nothing uses this device and /that/ is worth telling the user about. "Vender Inc Foobaz connected but you don't have a driver for it [Don't show me this again]".
Once /that/ works, it is extensible in a good way ("Connected device needs firmware file FooBaz-1.28.bin. Please install firmware and re-connect" and "The FooBaz webcam you've connected has an unsupported Baz controller") which tell a technical user what they need to know, and provide the non-technical user something useful to report to their tech support.
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