Aha. Now I understand why my Lenovo USB-C dock doesn't do 4K@60 on my Mac. It's not thunderbolt capable. By the way, it does have an extra limitation on Mac. I

Aha. Now I understand why my Lenovo USB-C dock doesn't do 4K@60 on my Mac. It's not thunderbolt capable. By the way, it does have an extra limitation on Mac. It only supports one external display. Apparently this is due to the Mac lacking support for Multi Stream Technology over DisplayPort (because it has Thunderbolt instead). Unfortunately Thunderbolt hubs are very expensive as the article also mentions. So I added a DisplayLink adapter for my third display (one 4K@60 directly connected to a USB-C port, the hub on the other with one HDMI out and the display link and lots of other USB stuff :) ) By the way DisplayLink support is pretty good now on Mac. Even for the new chipsets. I wouldn't call it nonexistent as the article does. It does have some limitations though, like Night Light not switching on.