Need Help with my Confusion on WIde Gamut and 10-bit displays

Bit depth and colour space are independent.

JPEG is a compression scheme; the JPEG bit depth is a variable (usually set to 8 bits but not necessarily). Adobe RGB is a colour space, which is independent of the bit depth that is used to code images into the colour space.

There is some confusion in this thread between the bit depth of (1) working space; (2) saved file format, and (3) display/print output format.

Only (3) is relevant to the discussion about 10-bit displays.