If the application of behavioral techniques does not produce large enough effects for practical value, then the application has failed. Practical value is whatever you define as meaningful for your child's life.
The original poster (OP) wrote, 'My second child is starting high school next year and is hell-bent on joining the marching band. I was in marching band myself when I was in high school and I wasn't against her joining. The discipline would be good for her. Then I found out how much it costs.'
Dr John Allan stated that Generation Alpha, many of whom are now approaching adulthood, are clear about what they want from their future. However, many do not feel ready for what comes next, particularly regarding the confidence, independence, and practical skills needed to navigate life after education.
He admires 'tiger parents.' He talks a lot about how the ideal parent is a strict disciplinarian, academically oriented, and pushes kids hard to set them up for future success. He thinks his teachers and his mom let him coast on his ADHD diagnosis, and vows that his kids will not 'get exceptions.' He thinks he would be more successful now if he'd had consistent parental pressure.
Parents hold a key that grants access to areas of their child's life that no one else can enter a foundational intimacy. However, more and more people are choosing to sever that bond and throw the key away. It's difficult to quantify how many children have decided to stop speaking to their parents, although some studies point to a steady increase in recent years.