I guess my main point is that, if we're going to move to displayport over USB-C, we (A) need Apple to put out official $100 cables, since I tried some cheap Amazon cables that didn't work and had to purchase some $60 moshi cables that I knew would work[0], and (B) they need a minimum of 5 ports since being limited to 1 peripheral port+3 monitors (2 over DP, one HDMI) on the mini is terrible. I know they want your mouse and keyboard to be bluetooth but no thank you.
For your information: AmazonBasics cables are very reliable and reasonably priced. You can get an USB-C to DisplayPort cable from them for around 10 bucks and you should have a lot less trouble with it.
In my experience spending big on video cables is only necessary for large distance and bandwidth requirements (like HDMI at 2160p60 over 20 meters).
They never really took off on laptops to begin with. However most PC GPUs are still majority DP despite USB C being tried as an easy connector for VR headsets and most monitors use a mix of DP/HDMI.
