In my experience, USB c is soldered to the main board while the plug is a small module thats attached to the module. It’s easier to replace a small module than replace a whole USB c port. Ideally it’d be on a seperate board too. But it might be a bit more complex.
My sister broke one of the two USB c ports on her Thinkpad and if the second one breaks (both support charging), I can’t fix it easily without sending the motherboard out for repair and spending like $200.
Edit: you can support both USB c and DC plugs. My laptop can (HP pavilion).
At least on my pavilion, it’s just one simple daughter board for one of the USB ports. It’s the one I use the most. I can replace it easily if it breaks. The pcb is also very simple so it ends up being very cheap.
The square shaped one threw me for a loop the first time I worked in a computer with one.
Very Andersen powerpole esque