I can't help feeling this is a bit of a backward step. There's no question that a braking coefficient needs to be used in an informed and educated manner but to withhold information that could be of value if used correctly (to protect those who might use it incorrectly from themselves???) smacks of nanny State-ism!
I refer you to the incidents at Bristol several years back, where several aircraft lost friction on the WET runway after landing. See the AAIB report which is
here - specifically section 4, para 4.4:
Safety Recommendation 2008-078: The Civil Aviation Authority should
clarify to airport authorities, pilots, aircraft operators and air navigation
service providers, that Continuous Friction Measuring Equipment must not be
used to assess braking action on runways which are wet, although it may be
used in the wet for assessing the relative friction of different runway sections
for maintenance purposes.
So not so much nanny State-ism, but ensuring a similar or worse event doesn't happen again.
It's times like this I'm pleased to be flying rotary wing A/C.
It's times like this I'm happy I work radar only in the sand pit lol