Yes, measures have been taken to homogenise the surfaces - grass has been slowed down, and clay (or at least the balls used for some clay tournaments) has/have been sped up. Not to mention the changes made to most of the hardcourts, and lack of carpet today.
But, I can't help but think that some people on this forum are underestimating the differences that prevail. Reading past threads on this topic, you'd think that the surfaces were identical, with only the colours changing from blue to red and to green! The footwork required to play at a competent level (let alone a world-class level) on each surface is very different. I appreciate that maybe this is hard to grasp watching on tv, but anyone who's attempted to play on different surfaces will surely testify to this!
Of course, the speeds of the surfaces and footwork are closely linked. But to say that these days anyone can play on any surface, as they're all the same, is ridiculous! If that were the case, we'd be talking about Murray as a favourite for the French, and Del Potro for Wimbledon!
Do you realize the retardation on display in this forum? Do you really think anyone here plays tennis in real life? Maybe 1 out of every 50, and those are generous odds.
I've never seen a single collection of people more clueless/out of touch/ignorant about a sport than posters here claim to be. Sometimes you read comments here and you laugh and think, wow that was a good joke, and then it dawns on you that the poster was actually serious.