Apologies if this question is super naive, but is there a good reason for ongoing development of both HDMI and DP? At least for my use cases (home entertainment, and work computers) both seem roughly equivalent.

The devices I've bought recently have tended to support HDMI more than DP. So I got the impression that HDMI was "winning" and DP would fade away.

But now it seems like vendors are moving towards video-over-USB-C cables. And the "Alternate Mode protocol support matrix for USB-C cables and adapters" table in this article [0] seems to indicate that USB-C cables have broader support for DP than HDMI. Which makes me wonder if vendors will converge on DP-protocol-over-USB-C-cable?

This makes me nostalgic for the relative simplicity of DVI.

[0] https://en.wikipedia.org/wiki/USB-C

HDMI is all about DRM. USB-C is just one of many reasons DP hangs on. The ability to chain monitors is huge for digital signage and other display uses too. Let's hope both continue to be developed since for computing display port is far more useful and free of at least some of the DRM hell of HDMI.

Indeed, the specs page says all 3 have HDMI 2.1 and 3x DisplayPort 1.4a: https://www.nvidia.com/en-eu/geforce/graphics-cards/30-serie...

However, Wikipedia says it’s capable of 8k with a proprietary lossy video codec called Display Stream Compression:

DSC is a "visually lossless" encoding technique with up to a 3:1 compression ratio. Using DSC with HBR3 transmission rates, DisplayPort 1.4 can support 8K UHD (7680 × 4320) at 60 Hz

The quote is from there: https://en.wikipedia.org/wiki/DisplayPort#1.4