The only thing that still matters are: the vertical back porch (it matters for variable refresh rate, too high and it will increase latency too much), the total

The only thing that still matters are: the vertical back porch (it matters for variable refresh rate, too high and it will increase latency too much), the total vertical blank (it must be high enough to give the source to time to reconfigure itself to go to power savings mode) and horizontal blank (it must be high enough to insert HDCP information and audio samples.) Sync polarities, sync width, horizontal front and back porch are usually ignored by monitors.