I'm dubious of the more control while sliding down the pavement as
opposed to the grass. Seems like it could very pilot and aircraft
dependant. Could you cite your source where this is "proven?"
And, yes, I am a member of the group "that has".

Something I have read, Frank. I cannot cite a reference.
It has to do with variability in the ground surface off the paved
runway. Culverts, drainage ditches, holes, etc.
The paved surface is generally "smooth", allowing the aircraft to slide
unimpeded. With a two-bladed prop, it is possible to bump the blades so
as to prevent a prop strike and mandatory engine tear down. This would
leave only the belly skins and antenna to be replace.