Simply put, it seems that this never took off and would require the entire hdmi chain to support it (tv, cable, and device) - none of which do currently, so for the medium future it doesn't seem to be a concern.
Plenty of concern elsewhere, just not necessarily here.
It's definitely real. A/V receivers are the typical devices to support HEC, so you can run one Ethernet cable to the receiver and use a smart TV with the HDMI audio return channel, with one HDMI cable.
> A/V receivers are the typical devices to support HEC
Then you surely can name a few models that support Ethernet over HDMI? (Somehow people keep claiming that this is totally a thing, but nobody ever can confirm a single device)
Can you name a manufacturer of devices or chips that has committed to never implementing Ethernet over HDMI? The same wires are used for the audio return channel, so they have to be present in cables. The HDMI consortium website still refers to cables as "HDMI with Ethernet".
If you claim that receivers are "the typical devices" to implement something, you should really be able to at least show one or two models that support it. No, it's never been formally declared dead, but it de-facto is by virtue of not existing in practice.
Simply put, it seems that this never took off and would require the entire hdmi chain to support it (tv, cable, and device) - none of which do currently, so for the medium future it doesn't seem to be a concern.
Plenty of concern elsewhere, just not necessarily here.
[0] https://apple.stackexchange.com/questions/325215/appletv-eth...