It’s funny that you mention mobility. I usually see people stuck an extra slab of USB C to HDMI/USB hub beside their thinnest and lightest Apple laptops so that they can use peripherals.
(e.g. my Air has two cables running into it, power and display)
It feels far more "mobile" than a setup where I need to plug/unplug all that stuff into the body of the laptop whenever I want to use my laptop away from my desk.