Machine vision (MV) is an important tool in Industry 4.0, autonomous driving, and other advanced technologies.
These days, most people use their Ethernet port to plug their router into their computer ... off and turning on devices without multiple cables running like you would need with an AC-brick-powered ...
It could, indeed; some extensions do that. Sadly, this means they only work in one rotation, and whenever you plug a cable into such an extension, you might have to flip it before it works.
This just adds to the multitude of other uses for that Ethernet cable. We’ve seen voice, data, composite video, VGA, and power. What else have you seen run over cat5?