In regards to the ideas themselves: When put in the rhealm of teaching students, then you have to get more practical and see how that translates into teaching. At what stages do you set this up to ensure that students will be "in the moment" as they play, and practise with the right mindset? What types of things might be done in teaching that may undermine the chance of this developing? How might it be done at each learning stage? If a teacher at a school only has a general idea in the manner presented, and if it is then presented as generally and abstractly to students, it won't work. Many posts seem to stay at lofty, abstract levels.
In regards to this:
The attacks become enjoyable mainly when we learn how to minimize the tension involved in their production. This happens mainly when we can abstract our minds from the mechanical side of performing and we can focus on the sound production as the main concern of our playing.
There are debates on whether to focus on sound or action. I believe it is chicken / egg and depends where a student is at. I, as a student, must focus especially on the mechanical in order to get the sound. That is because initially I was self-taught and developed awkward movements to create the effect In envision. I am relearning better ways of moving, which are also more effective toward the sounds I want to reach. The only way I can do that is be focusing on the mechanical, otherwise I'll slip into the old awkward motions. For students starting out, this can be set up that they fall into natural and effective motions from the get go. Here we get into the how and details of teaching. An abstract idea won't take you far unless you know how to implement it.
In what I am learning both as a student, and as a student getting the pedagogy side, is that there are details involved which set up such things. For example, if you don't have a grasp of where you're going and blindly aim for the next notes while you're already underway, this can cause tension from hesitation or inaccuracy. Teaching things and approaches that create that grasp is the answer. Concentrating on this note, then the next note, then the next, can lead to staying on each note individually in a start-stop-start mentality with the same kind of effect as if you constantly slam on the brakes and then get going again. So there may be the concept of each note being a transition toward the next note, and that can also be mechanical.
What I'm signaling is that there are how's to all this - underlying things. The abstract notion, without real ways of getting there, can almost be dangerous to a student. In fact, the teachers I work with rarely if ever talk about being in the moment. They implement solid, concrete things that bring it about. The concern themselves with rather concrete things, but hold these kinds of concepts in the back of their minds.