Osiris
I permanently banned my 6 year old daughter from using the PS4 for mistakenly sending grief reports as it's too hard to watch or talk to her
This is not true. See page 105 onwards. and they wouldn't encode 8-bit components anyway, but pad with zeros in a 10-bit value. But that would be incredibly wasteful.
But again this doesn't matter because the HDMI in the dock is NOT using the USB bandwidth but an actual HDMI signal on the same cable running alongside full bandwidth USB.
Getting way off-topic here, but for the sake of clarity, you would be right if any equipment worked internally in YCbCr 4:4:4 colorspace, but most if not nearly all internal digital processing of images / colorspace is done in YCbCr 4:2:2 instead, as the extra 2 bit's allow "headroom" to stop truncation and loss of data when performing operations on that data, and the data is not just simply packed / zero padded, it is encoded from YCbCr 4:4:4 to YCbCr 4:2:2 and it is sent as YCbCr 4:2:2.
YCbCr 4:2:2 is 10bit.
There is very little gain in working in internally in one device in 10bit, encoding to 8bit for transmission, then re-encoding at the other end back to 10bit for more processing, so it's just not done, they just transmit the 10bit YCbCr 4:2:2 instead, thankfully for gamers, that encode/transmit/decode would only add to processing latency
If you can get your hands on a protocol analyzer that can handle the speeds necessary, you can see for yourself with a simple probe. (Not that tapping the line is ever "easy", If ever there was a great demonstration of the "Observer Effect" from physics, realtime protocol analysis comes the closest