No I am not, I am talking about 1st serve % won, not aces or cheap points won.
I realize that but in the beginning of your first paragraph:
I dont know why there is so much talk about how Federers serve is so effective even if he doesnt hit that many aces.
I was addressing that part of your post.
Still, there is no doubt if he could increase the % of first serves won he would be even more difficult to beat than he already is.
But then again, if he does go for more "oomph" on the first serve to do that he might do it at the expense of consistency and accuracy and that could negatively impact the rest of his game.
Roger being Roger I trust he knows what he is doing and he has found the right balance between power and precision where the first serve is concerned, even if it means he is not the outright best player in % of first serves won.