Or you want to make circles with it all the time to simulate our arm movement to strike the ball ?
--> Yes and no !
To hit a
normal strike, you just have to hold the right joystick (RJ) down in the diagonale of the desired direction. The longer you hold it down before hitting the ball, the more precise the shot will be. Just as currently. But the direction is already "selected" when preparing the shot. Which is, at least to me, more representative of a real shot : you give a direction to your shot instead of "adding" left or right effect to it.
If you want to hit special strikes, in this case you need to move the RJ before hitting the ball. But you still have to pull it down before making your movements. And the principle "The longer you hold it down, the more precise the shot will be" remains valid.
So,
to hit an acceleration, you need to move the RJ forward before hitting the ball (in the desired direction, obviously). The faster you move, the faster the ball goes.
To hit a
short strike, you need to move the RJ forward, but halfway compared to the acceleration strike. You stop in the initial position. And the speed of your movement will determine if it's a short acceleration or just a short strike.
To add spin to you strike, you need to make a quarter circle (or more if you want more spin) motion outward (to the right for a forehand, to the left for a backhand (for a right handed player)) before hitting the ball. Again, the faster you move, the stronger your shot is. This outward motion kind of simulates the racket motion.
To hit
a slice, you need to make a half circle motion inward. If you want to hit a short crossed slice, we can imagine that you need to make only a quarter circle motion (because you need less depth than a straight slice).
To hit
a drop shot, you need to make a full circle motion inward (a drop shot is somewhat like a very strong slice).
To hit
an aggressive lob, you need to make a full circle motion outward (a lob is somewhat like a very big spin).
And to hit
a defensive lob, it's like a normal strike, but you just have to hold the left trigger.
I don't have any idea if all of this is technically feasible (recording the RJ motion, its speed, the angles, etc, and transcribe it to the shots). But I'm convinced that it would be fun to play it!
At this point, it's unlikely that I'm going to change the control scheme.
Well, I think I fully understand

But I really wanted to share these ideas. I can't help thinking about it and whether it's non sense or not. Because when we think of tennis games (or sport games in general), we still play the same way as in the 90s. We just added more buttons, but there hasn't been that much evolution in the way we control our characters (especially according the double use of the left joystick: moving the player AND "selecting" a direction). And despiste the fact that you managed to create a f****** great gameplay (I really take great pleasure in playing TE4), the different moves, which are the essence of sport, are missing (of course I'm not talking about the movements on the court). For example, the difference between performing a spin or a slice is important. And if there is a way to transcribe such a difference to a higher level than just switching the buttons, it would be just amazing
So, thanks for reading me, thanks for your previous answer, and most of all, thank you for your incredible work!