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).
0: https://us.moshi.com/products/usb-c-to-displayport-cable?var...