It’s easy to find a TV with USB-C input, though not universal. That still uses the DP protocol, and cables with different connectors on opposite ends are both cheaper and more common than those with HDMI as a result. Also, this is only even an issue if HDMI 2.0 isn’t fast enough for you, so old devices aren’t a concern.
The only down side is DP Alt mode is optional and must be enabled and supported by the internal controller and system. In order to do that, you might as well just go full DP at that point and somehow I don’t think the manufacturers are gonna spend more money on that. Most likely the USB-C port only supports a mass storage class device.
I don’t see “relevance for HDMI” ending anytime soon. Tell me how easy it is to find a TV with DP inputs. Nearly 99% of consumer gear uses HDMI.
It’s easy to find a TV with USB-C input, though not universal. That still uses the DP protocol, and cables with different connectors on opposite ends are both cheaper and more common than those with HDMI as a result. Also, this is only even an issue if HDMI 2.0 isn’t fast enough for you, so old devices aren’t a concern.
The only down side is DP Alt mode is optional and must be enabled and supported by the internal controller and system. In order to do that, you might as well just go full DP at that point and somehow I don’t think the manufacturers are gonna spend more money on that. Most likely the USB-C port only supports a mass storage class device.