Don't you see how a random device with an Ethernet cord being able to change its MAC address and send arbitrary packets is a wormable threat actor?

...and then let it do the same but without the Ethernet cord requirement?

Drive around with a white van that says "Free Candy / BLE Persistent Threats"... pwn devices as you walk through the metal detectors on the way to China.

Wireless, wormable, arbitrary packets, spoofing arbitrary devices and you don't see the issue?