I agree with
Jirafalox.
For club players, the serve is probably the most technically complicated shot in tennis. But pro players have already mastered it.

And TE4 aims to simulate professional tennis, so serving shouldn't be overly complicated or difficult to execute.
As for serve accuracy, I think the difference with real-life pro tennis is somewhat exaggerated here, although there's still some room for improvement. I may retune it in the future, though.
