Absolutely agreed- but there's more to it too. In tennis, you don't have to hit another shot within fractions of a second. In that respect, the manner in which you intend to behave after a note is not just about that keystroke but also the next. After the sound, it becomes analogous to how the feet are planted before a tennis shot- with regard to sounding the next note. If you're not poised well in either scenario, you cannot expect to control the action. Excessive relaxation can be equivalent to lying down on the floor between shots yet hoping to keep the rally going. Serious technique requires low effort but sustainable balance- not moments of extremely flaccid sagging after every keystroke.
Yes, agree, I guess my analogy had to deal with simply the follow through.
As one teacher put it, when you're fully relaxed, you're asleep. And so he didn't really like to describe it as relaxed. I forget the word he used.
I don't think sports analogies give much insight into piano playing - maybe a table tennis player sat down returning 8 balls a second? Even then....
Why not? Tennis isn't just hitting a ball back and forth. You can't hit the ball with any real control without good form. While there is no artistic aspect to sports, piano is very physical, and sports are very physical, both seeking efficiency in movement in order to achieve the intended results. Since we are talking about technique, although technique lends itself to artistry, I don't see why a sports analogy doesn't work.
As for any joe being able to depress a key, no joe can really do much after the key is depressed besides releasing it. (well they COULD play with the pedal i suppose, but we're not talking about pedal.) (SPEAKING OF WHICH, there aren't enough discussions about pedal I think. There is so much that we can do with the pedal, and yet all the posts I've read on this forum are people wondering WHERE to use pedal when it's unwritten rather than how.)