For high power laptops, the relevant USB-PD versions with sufficient wattage are too recent to have penetrated all product lines. But I haven’t seen a new laptop without usb-c charging in a long time. Even laptops that ship with their own bricks support usb-c charging as well (this will still be allowed by the EU law). Maybe you can identify a couple that don’t. I wonder how much market share they have and if they even matter.