This particular quest builds on a small amount of Mindfulness training.
The fact that this suggests falling back on a single technique in the face of a range of 'difficult emotional situations' is not ideal.

I live with a workaholic, and this is exactly the kind of thinking that he is trying to learn not to do. A workaholic applies simple techniques unilaterally, without taking into account the nuances of a situation, so this kind of advice is dangerous for someone like him.

Why not build on a mindfulness base with mindfulness?
Thinking "What do I stand for?" is not going to be useful in all circumstances, and might actually make things worse sometimes.

The whole powerpack also completely ignores the need for communication (another workaholic trait,) where sometimes the most powerful way of solving a problem is to simply say to the people involved, "I'm having a strong emotional reaction right now, so right now I need to go deal with that, but I would like to talk this through afterwards."

Mindfulness is about clearly communicating with yourself by cutting down on internal noise, allowing you to clearly identify and ask for your needs from others. It should also allow you to hear and respond to the needs of others. Interdependance is a key part of mindful action, and needs to be built in to this powerpack.