I don’t know if i’m fully there with this advice. Some of it sounds like the writer wants you to be more monotone than you feel. To control the way you express your reactions.
Expressing your own emotional reactions to/in front of a child is surely important in their development.
That said, the writer’s key point about accidentally switching a child’s motivations for learning things through the parent’s actions is well put.
I’m gona take what you’ve said here to heart, and try to remember it. As you say, lots of people are ready and very willing to give their advice, its not always for the best of reasons. Thanks.