Power over Ethernet (PoE) basics and beyond

Is POE really relevant in the consumer space? All of my laptops get power and wired data through their USB C port. Does it make more sense to just send data over USB C?

For example, my Chromecast gets power and wired ethernet through its USB C port. (I have an official Chromecast power brick that I plug an ethernet port into.)

You wouldn’t have to worry about POE in the device category you mentioned.