Before HDMI 2.1, DisplayPort already supports high refresh rates (greater than 120Hz) at high resolutions. Also many high-end PC graphics cards offer more DisplayPort ports than HDMI.

I think most graphics cards nowadays come with roughtly 3 DP ports and 1 HDMI port. It might be different for things like the Multi-media cards that are on the low-low end of the spectrum (think of GT 730 level in a generation) might have more HDMI ports since they are more intended for such an audience.