I bought a cheapo capture card a while back but the quality is pretty terrible
Is there any reason PCs can’t just receive HDMI/displayport input from other devices through the same mechanism they output it?
For that matter also is there any reason HDMI can’t be run over Ethernet? Afaik ethernet has far more bandwitth than hdmi nowadays
PC GPUs simply aren’t built with HDMI input and passthrough. The manufacturers could do it though if they wanted to.
Yeah the functionality is pretty trivial to implement, but that kind of thing is typically reserved for high end workstation graphics cards.