USB-C (or Thunderbolt) can also carry a DisplayPort link natively, and you don't even need a dongle for that. Workstations don't really care about HDMI, that's for TVs.

Not only that but with the Ultra variant, all of the USB-C ports are thunderbolt 4 ports at 80gb/s, that's a massive amount of IO.

(note that despite the number of ports - only 4 of them can be running displays, plus the HDMI port gets its own channel)

On Max it's only 4 thunderbolt ports (and I would assume 2 displays + 1 HDMI since it's half of an Ultra) but still, that's about 2x anything else on the market.