No, a good coach sends the team home rather than allow them be sloppy in practice. I have been sent home for not being focused.
You really don't give an inch do you???
Anybody that has ever played a sport has had a practice cut short for being "sloppy in practice". However, I promise you nobody has ever been sent home for not being "perfectly focused". Unless, they are in training to be Zen Masters. Coaches understand that they can only get so much out of their players. Since 100% focus is not possible, it is the coaches job to determine how out-of-focus he can allow the player or team to get before he calls it a day.
At some point the "perfect practice" concept has to break down. I guess the theory goes if you can only maintain "perfect practice" (whatever that means) on the pool table for 10 minutes than that is all you should do. I say - THANKS, BUT NO THANKS to that and I press on until I feel that my practice is no longer beneficial. I promise you that I (and a lot of people) can still learn things on a pool table without being perfect. This is usually when I work on my kick shots. Now I know I could get better at kicking if I was more focused while working on it but my kicking has definitely improved even while I was unfocused during my practice.
The key is the diminishing returns.
I did say I might be the only person on AZ to think this way
:deadhorse: