But the buffering is not required because of the HDMI link; a display could update each pixel as it receives it over HDMI, just like CRTs did. LCDs buffer at le

But the buffering is not required because of the HDMI link; a display could update each pixel as it receives it over HDMI, just like CRTs did. LCDs buffer at least one frame for many reasons, but "because HDMI requires it" is not among them. And compressed vs. uncompressed does matter, especially when you're talking about video compression. Because compression requires some minimum amount of data before it can even begin to compress, let alone start to send the compressed bitstream over a physical link. And then you have more latency as you add a decode step. Not to mention the complete lack of latency guarantees a wifi link has...