Some monitors kind of do this. They have usb-c connectors for laptop video and charing and can do kvm-ish stuff, having a usb hub for talking to a keyboard and mouse (switchable between inputs).
I have a ViewSonic ultrawide like this, picked it up as a factory refurb from their eBay account. Makes it incredibly easy to switch between work and personal laptops (Mac and pc), as well as a gaming tower.
look for dell monitors with kvm