I'm trying to be as helpful as I can regarding the Mac OS.
As I mentioned earlier, sometime back the Mac OS recognized HDMI as "any ol' signal" the way Windows still does. If you used HDMI, the OS just worked with it.
Then someone at Apple made the decision to make HDMI behave correctly only as what it is - a digital HDTV signal. Lots of upset people who suddenly couldn't select the resolution their monitor was capable of. The OS instead limited them to standard HD resolutions such as 1920x1080, even though the monitor's native resolution was higher.
There are a pretty fair number of such posts in these forums from that point on. Why did Apple do that? Got me. I just know HDMI is an issue for folks trying to use it as a computer monitor connection. There likely aren't more because most users don't understand profiles, or how to use them. They plugged in their new monitor to their Mac via HDMI, turned it on and got a picture. Everything must be good.
It does somewhat depend on how good of a monitor you bought. HDMI will work if the firmware in it will correctly negotiate with the OS what resolutions and sync speeds the monitor supports, and what its true native resolution is. Cheaper panels won't.