At least for the Lenovo ThinkPad X1 Carbon Gen10 I know that they use a hybrid FFP/micro coax design. FFP to fit behind the display panel as the cable runs up to the sensor assembly and micro coax for fitting through the hinge. I don't think you'll see a lot of purely coax based designs, given the trend to thin displays with small bezels. Other laptops like the Dell XPS 13 Plus run straight FFP from the mainboard all the way to the sensor.