FezAzulay,
I mainly have problem with crossed balls, either short or long, and it's the ones that will lead me to not center well the ball in my racket if I play without preview.
I also have a bit of problem, but less, with the bounce height & length ; I guess this one depends more if your opponent has a lot of topspin or not and I tried only with an opponent with normal/low spin.
But I read many reports where people have trouble with short balls, so I guess we're not equals in our difficulties against the ball trajectories.
So only showing the preview in some cases wouldn't be a perfect solution.
Your basketball example doesn't correspond to our present case : here, I want to re-create within a video game what happens on a real court, not change the rules of the sport. On a real court I don't have problem seeing where the ball goes and never ever air-swing (ie: miss the ball coz I was just a bit too far from it), while in-game, without preview, I have many difficulties and air-swing sometimes which is very unrealistic. When I play TE, I want to step in the shoes of Federer, not in the shoes of a half-blind mole...

And even with the preview and the Danger Zone, you still don't have a perfect indication of the ball height, and thus you still have room to play a better strike by stepping into the Danger Zone if you see the ball trajectory better than the average player. I think it's quite enough to break any predictability and create different patterns between players (without talking about positioning handling, strike selection, reflexes, anticipation & everything else that comes in matter of being good at TE

).
I perfectly conceive some people prefer to play without preview, for a better immersion, as in "realistic TV casting", and/or even to add more difficulty to make the gameplay more "spicy", but personally I very prefer the realistic gameplay of a tennis simulation, as in "being in the head of a pro tennis player"...
