The Computers Are Bad blog discusses the shift in home theater away from the audio/video receiver and speakers to just televisions with soundbars.
The post talks about the evolution of HDMI via SCART and control signals such as AV.link which migrated to the HDMI Consumer Electronics Control pin.
Because CEC inherits the AV.link features designed for SCART, it has a surprisingly rich featureset. For example, if you have an HDMI switch with real CEC support (these don’t seem to be that common!) and a TV with software support, the TV can discover the topology of connected devices and remote control the switch to use the switch inputs as an extension of its own input selection menu.
Most CEC features are more prosaic, though. Considering the list of high-level features in the specification, “One Touch Play” means that a device can indicate that it has video to show (causing a TV to turn on and select that input) while “System Standby” means that a device being turned off can tell the other devices on the bus to turn off as well.
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