Is yoga, perhaps, the harnessing of control over the cognitive and physical abilities we each developed in childhood and adolescence?
Patanjali seems to be suggesting that most individuals reach the Formal Operational Stage, or adolescence, with all these newfound cognitive and physical abilities but few people actually know how to use any of them together effectively. These skills, when used with intention and control, are all useful. But add in a little extra noise, a few too many demands, and the abundance of material items to distract them with and we can start to see people becoming distracted, self-centered, and disengaged.
Patanjali seems to be offering a brief instruction on how to further advance a persons overall development and well-being.