On the topic of pro players not being "in tune" with everything...
I think I can provide a little bit of insight on this, being pro skier on the IFSA Freeskiing Circuit.
People would frequently ask me stuff, like:
"What skis should I buy"
"How much does your equipment cost"
"what do you think about >insert whatever here<"
Most of the time I had no answer, because, for example, the gear that I'm on, is so drastically different from what they need. Likewise the topics that I read up on are completely different than what recreation skiers read in their magazines. For example, most avid recreational skiers have a much more in depth knowledge of what equipment is out there in the retail market. I know about my sponsors gear, and about the specialty, high performance skis that my competitors are on, but I have no clue about anything for the "average joe".
People would ask about what was I working on in my skiing, thinking that if they applied the same focuses, they would be instantly brought up to my level. My focus would be on some rediculous nuance that would fine tune just a fraction of one phase in a turn, when they needed to be focused on basic fundamentals.... fundamentals that are second nature to me and require no thought what-so-ever.
Most likely tennis pros are likewise focused on obscure things for the same reason. A grip, something that Rodger has been doing since before he could read and wright, is completely trivial to him. Not that he hasn't experimented with it, its just that he probably played with his hand placement over time and found what works best for him. He's thinking of the shot he needs to make, and the grip just happens. His body knows what to do to make that shot. This is probably why, there are pics of him with an eastern grip, and pics of him with a semi-western. This is the same reason, when skiing, I'll use terrain unweighing on one turn, and absorption on the next while arcing GS turns down a mogul run. Its just what I need to do to make the turn shape that I need to make. I don't think about the process at all, at that level, you just execute.