Johnson is no fool,if he can gain a small percentage advantage by doing this fair enough.
I remember when we got relegated in 75-76 we played Man Utd at Old Trafford it was very early in the season and I thought at the time the grass was very long to play football.T Doherty was there manager was there manager and had just got promotion to division 1. He had built a very young team with bags of pace,they ran us ragged and beat us 5-1 ,I always thought that the ball was holding up in the extra long grass which played into their hands.Nothing ever was mentioned about this but I thought it was deliberate and gave them an advantage.We had Woody &Curry playing but we were put to the sword cruelly
We never really got going that season at all and we're doomed by March.
So maybe Johnson has method in his madness small margins in football ,he obviously feels it helps.
Maybe he has talked to the Doc and has took it on board..
Just a bit of useless history from me !!!!