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Being able to root your tablet or smart watch is often a good thing. You gain more control over the device that the manufacturer greedily stole from you whilst trying to cage you in their walled garden. Of course, these devices almost always act as clients and do not have server-like services "listening" on a network port.

A router or light bulb, however, do listen to a port on the network. Being able to remotely root these types of devices are definitively a bad thing and an obvious security vulnerability that needs to be patched.