> With respect to HDMI, it's very common in offices and for people speaking at events, but most consumers wouldn't use it much.
Completely false. Most cheaper CONSUMER monitors today come with only two inputs: HDMI and VGA. More expensive ones come with Displayport in addition. All TVs have HDMI ports. What else, aside from monitors and TVs, are consumers connecting their laptops to??
While I'd probably prefer more ports, there's certainly an argument to keep things simple with USB-C and let most people buy their adapter of choice.
With respect to HDMI, it's very common in offices and for people speaking at events, but most consumers wouldn't use it much.