I often see this kind of suggestion in the forums, and I suspect that this is probably a issue of the amount of impact that
Consistency has. Additionally,
Focus also has a strong impact on this issue.
At the moment, the amount of work that a forehand and backhand Consistency plays seems a bit large (especially for players who are familiar with the basic controls of TE4). In other words, it is too easy to deal with fast, low and high balls as a matter of course like Djokovic. So it seems that not a few players would like to make tennis more difficult by increasing the handicap for such tough balls.
I'm trying to address this issue in my experimental mod, and have set the base value of Consistency to "27 below compared to power". This setting may be too extreme, but I recognize that it is too easy to hit a good enough shot when power and consistency are at or near the same value.
Having said that, I don't think TE4 is only played by tennis fans who play it for hundreds of hours or more. Considering that there are also a lot of casual video gamers out there, making it too difficult to control might not be a good idea.
If it were possible to change it optionally in Tennis.ini, that would be lovely...