Rules question on playing a ball that may go out of bounds
Basing my experience only on Tennis, Badminton, and Ping Pong, if a ball is clearly going to be out but someone plays it, that's a live ball. If I were playing ping pong and someone decided to jump to return a ball and ended up hitting it wide of the table, they couldn't call "that would have been out" and refuse to accept that they made a poor judgment and attempted a return that didn't pan out.
I played pickleball yesterday, and I was given feedback that if a ball was clearly going out, it is a courtesy to acknowledge it, whether a player tries to return it or not, and pass the serve. Is this real? To me, this seems hard to prove what would have gone out and what would not have. Even if it is obvious that someone should have let the ball go, if they hit it, isn't it a live ball?