tribo Thanks for the update, I am getting out of date in retirement.
However back to the questions:
Are these definitions still valid?
Are there other definitions . . . in operational use?
Or even more important;
What are pilots taught about the definitions of runway conditions? And what do they understand about them and aircraft performance so as not to be confused?
What and how will ATC communicate the runway conditions to pilots?
Is this what you are seeking; if so then probably most of the industry is looking with you.
Is the comment “There is no overall accepted certification / operational correlation between mu meters and airplanes” still valid? I have mislaid the source reference.