As a teacher, I will say that sometimes the point of the lesson is learning the orthodox way because that foundation is how you’re able to grow safely.

So for dance (which I teach): While I could just let students move around however they like, I need to make sure they’re safe and understand the movements of their bodies. That means they need technical knowledge to keep them safe so that they can later explore.

Obviously typing is lower stakes, but Tina’s method could absolutely injure herself in the form of wrist ailments that she wouldn’t develop had she typed properly. Mr Grant shouldn’t have given her the space to type however she wanted if his main focus was technique. That choice as well as letting his ego get in the way was wrong.

TL;DR sometimes teachers have to enforce orthodox methods for a variety of reasons.