HDMI Cable Power, HDMI Ethernet, HDMI over USB-C. The display standard is actually ubiquitous and even allows remote control of devices. However, a lot of what HDMI can do is not or only little used. Even HDMI over USB-C is still missing - from a purely technical point of view - even if that sounds strange at first.
https://www.notebookcheck.net/HDMI-A-standard-with-a-lot-of-untapped-potential.573445.0.html
HDMI is bad because it's not free. DisplayPort can do the same and even better. It is patented. we not should use patented solution