I posted about this a few days ago from Ars but it never gained traction. Not sure how this one is on the second page.
https://news.ycombinator.com/item?id=28922638
Anyway I’ve had issues with DVI support 1.2 support and recent versions of MacOS. A monitor that previously worked for a year stopped working until I downgraded it to a lower DVI version.
Maybe someone has had a similar experience with HDMI and MacOS limitations.