There's a video on Cathode Ray Dude [CRD]'s YouTube channel about Alienware's combo laptop/monitor where he goes into the inner layout of supporting all sorts o

There's a video on Cathode Ray Dude [CRD]'s YouTube channel about Alienware's combo laptop/monitor where he goes into the inner layout of supporting all sorts of inputs/outputs, which I found pretty enlightening: https://www.youtube.com/watch?v=Otln0Ao2z6M https://www.youtube.com/watch?v=Otln0Ao2z6M (starting about 8 minutes in, with a pretty neat diagram at 12:39). And yeah, you're exactly right: It adds cost, even with a seemingly "simple" device like an iPad that has only 3 possible signal paths (To Display, Out to USB-C, In from USB-C).