Thanks for the good review! There is a coach's discount so email me before you subscribe.
And yes the court surfaces especially combined with the poly string are a huge factor. I've hit on some of the show courts in Cincinnati and Indian Wells and man they are gritty and slow--don't fall down if you don't want to bleed.
If the hard courts were fast and slick like in the old days and the indoor courts bounced like the old supreme court that might shift the balance of style for at least some players.