Peter R. wrote:
Again, had I been a low time VFR pilot launching on a cross country, I
certainly would want to know about haze limiting visibility, for even 10
miles and haze will appear much lower as the sun draws closer to the
horizon.

This P6SM stuff is one of the (few) ways the ICAO weather reporting
system of TAF and METAR is inferior to our old SA/FA system. The old
FAs used to forecast visibility as 10, 15, 20, whatever was
appropriate. Now all that just gets folded into P6SM. For somebody
planning a VFR X/C (especially a student or inexperienced pilot),
there's a big difference between 6 miles and 20 (or even 10).

It's not like the computer models can't differentiate between them.
It doesn't even take any more characters to transmit. It's just plain
dumb that the information exists and is kept hidden.