This is a category error.

Meaning > Motivation > Mechanics, but Measurement is how you know that Meaning > Motivation > Mechanics, and, more importantly, Measurement is how you prove to anyone else that Meaning > Motivation > Mechanics (or even that you've built any motivation in your students at all).

Measurement is how you prove that your approach (as opposed to anyone else's) is worth people investing their time and money with you.

Trust > Meaning > Motivation > Mechanics. How do you earn trust from a stranger? Measurement.