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Valve: HDMI Forum Continues to Block HDMI 2.1 for Linux
(www.heise.de)
This is a most excellent place for technology news and articles.
I'm not sure where you're getting your information, but displayport absolutely supports audio. In most of the same formats that HDMI does as well.
Also, I've only ever had issues with HDMI plugs. All the displayport plugs I've used had positive locks on them and have been the most reliable plugs I've ever had to use aside from BNC connections.
You could perhaps have instead gone with "you don't find displayport on cheap consumer displays," because that's an accurate statement. That's a huge part of why this is a big deal.