There was a period in the sixties (when I wer't a lad) when umpires disliked yorkers so much that they would get the groundsman to do something about the block hole during the lunch break. That seems to have died the death during the intervening years. Even worse is wear on the pitch from fast bowlers' feet.

This explains why our home matches are nearly always played on the artficial wicket. I and a few other bowling team members enjoy pitching yorkers. Pitching them into the block hole dents a real wicket and the batsmans parry does much the same damage rendering the wicket unusable for several weeks after the game. So we part-timers get the astroturf - which just can't get the bounce or the spin.