8-bit YCbCr 4:4:4 is not bad either, it is much better than YCbCr 4:2:2 and only very slightly worse than RGB (RGB cannot be subsampled).
4:2:2 means two out of the three image planes are at half resolution, the way humans perceive color is weird so we don't notice all the information loss but the signal does have a lower spacial resolution. Bluring together the color of every two pixels horizontally so you can get some extra steps between color values is not helpful and preserving the dithering at full resolution is important. The exception is when your display uses 4:2:2 internally, then it often isn't any worse to have the GPU do it first.
