For that you want something that is ubiquitous anyways and works with everything. For samsung that was HDMI and usb (kinda works, but too many cables) a few years ago and nowadays is just a single usb c cable. Works with laptops, tablets and phones.
Counter question: Why aren't docking stations for laptops common in hotels/coffee shops/wherever? Or am just not staying in the "right" hotels? To me it just seems that the demand is pretty tiny.
Well, there is an attack called the "evil maid" attack. This attack can happen whenever your hardware is unattended for some period of time. A hotel where maids enter the room every day unattended is quite literally the scenario for this attack. Imagine the surface area for attack, where a dock gets modified, then an unsuspecting user plugs into the dock.
Not only is the demand tiny, but the liability is incredibly high for hotels.
The world doesn't exist. And it's not that much more expensive for the workplace to add the computer, and it's much more convenient to just carry our own ultraportable laptops so that we could work at coffee shops and on the planes.
But perhaps there is an use case out for parents with multiple kids who don't want to use low-powered or hand-me-down computers...