Yup, and that's fantastic if you're working at a consistent desk or something. I have a USB-C hub at home and a USB-C monitor at work, which is pretty nice.

However, what's not nice is connecting ad-hoc. Let's say I go to an unfamiliar meeting room, HDMI is the way to go. Or if I'm going to plug in to my TV at a rental property or something. Or I'm at a friend's house and I want to transfer a bunch of data and they have a USB-A drive. I'm not going to bring a hub around with me everywhere I go, I'd prefer to just plug in whatever I need into the laptop directly.

USB-C is great, not having other options as well isn't great. Give me 2-3 USB-C ports that can all do charging, display out, and data, and also give me a handful of other ports (HDMI, USB-A, RJ-45, headphone jack, etc). It's very rare to find a laptop too thin to support it, most "thin" laptops are merely curved at the edge to make it look thin, when really it's plenty thick to support even full-fat RJ-45 (which it doesn't even need to, I've seen thin laptops with a flip-down port).