Safetypee and PJ
Unfortunately, the aircraft ahead that had good braking action may have produced the poor braking action that the following aircraft experiences by blowing liquid with deicer off the surface and letting fresh snow fall on the water freezing in the wake of the landing aircraft's reverse thrust. Two minutes later there is a skating rink nicely prepped for the next aircraft.
If a lot of the automatics are predicated by WOW and wheel spin up, then the question has to be asked - what if they don't spin up?