Give it a read, oh payers of the lesson fees, and understand.
(And replace “piano” with “trombone/baritone/euphonium/tuba” and “big black beast” with …I don’t know, “shiny brass beast”?)
Disclaimer: I don’t think any of my current students or parents feel that lessons are the be-all-end-all of their children’s musical education. We all know that practice is necessary to develop skill, and skill necessary to develop enjoyment and expression. I think the points about busy schedules and insisting that children “do everything” are valid. While I understand that we don’t want to place any limits on what our students can achieve, we should allow them some time to find their feet doing something they like.