Several PGA events this year had a day or more of Preferred Lies.
Really, these players are the best of the best... is it too much to ask them to play under current course conditions (unless lightning causes safety concerns)?
It rains on the course I play, the wind blows, snow happens. I have never quit a round, or asked for "Preferred lies" because of weather. Golf is an outdoor game, weather is a player one must contend with. No clean and place except on the putting surface or in the case of an embedded ball (fairway only). Casual water means nothing unless it is flowing enough to move the ball.
Pros should play the ball as it lies! If conditions become hazardous to the safety of the player, play should be suspended till the safety concern is ended. Play should resume at that time regardless of rain, wind, sun, eclipse, solar flare, planetary alignment or course condition.
Play the ball as it lies pampered pros!