See the link taken from another thread.
Managing the Threats and Errors during Approach and Landing.
Slide 26 shows the marked difference in mu (runway friction) between a ‘wet grooved’ and a ‘wet smooth’ runway; a difference in reporting from Medium (grooved) becoming Nil on a smooth wet runway. If the runway is actually flooded - contaminated, then even a grooved runway may only have Poor braking.
Sounds like an avoidance strategy all round, providing the appropriate communication about w.i.p. (work pending) and runway state is made.