I had to go back to see what I wrote
"I would not practice scales either, if not the right time for that."
Where did you get the rest?
That only means that IF my teacher ever expected me to study scales on a given time, she would be as disappointed as the OP. Because I would try and IF I realized that I am not up to it, I would use my own judgement and do something else.
I have never claimed that for someone else it wouldn't work to just sit down on any given moment and decide to practice scales and do it very effectively. I am sure it works for you. Count yourself lucky.
I got the rest from the very next sentence that you chose to omit from the quote:
"The difference between a child and an adult is (often) that an adult is aware of when the practice is inefficient and would rather not, while most children will just do what they are told whether useful or not."
ie you think you have all this special knowledge that makes your failure to do something that a teacher asked you (because he the has the experience to know it is useful) some profound act based on wisdom. It isn't. It's a case of giving up on something and not having the perserverence to push yourself into completing the task. A child who doesn't know so much but tries their honest best will reap far more than an adult who finds a dubious basis to not only duck out of a task, but to lie to themself that it was actually the best thing that they could have done for their progress.
Regarding the rest of your points, I didn't make any assumptions- other than based on what is universal. If you can drop your "I'm so unique" story for a moment you may realise that all playing is initially acquired via visualisation- unless a student learns a piece by someone else literally moving their fingers for them on every note until they have learned a habit. Tell me, is that how you learned? If not, everything you have achieved was first acquired via an act of visualisation- just the same as with everyone else.
Sit at the piano and play a c with r.h. thumb. Close your eys and now play a g with the fifth. Is that an impossible task? If not, you have every capability to visualise and to continue developing the skill into more advanced forms. Now do the same but move your whole arm and play the G with the thumb too. If that's reliably possible, you have a slightly more advanced ability to visualise. Even if not, open your eyes. Now look at the G. You are visualising it and then using that to guide your thumb to it. Even using the sight involves visualisation of the key, prior to approaching it.
Stop making these silly excuses and start concentrating on what you are perfectly capable of and expanding on it. Nobody who can play the piano to any level at is incapable of visualising. Anyone who can visualise at all can learn to do it better still, if they know where to put their mind in order to improve on the depth and clarity of it. I don't "see" a piano keyboard in my mind ever. I have a mental map of the keyboard that is equivalent to sight but based on a mix of senses and habits. If you can't do it purely in your mind then practise the scale with one finger and by simply looking at the notes of the scale while staring at a keyboard. There are ABUNDANT techniques that you simply need to discover in order put your thinking in the right places to flourish. If it wasn't possible, neither would you have been capable of learning a single piece of music, ever (nb. the repertoire you are playing demands considerably more clarity of visualisation to even get off the ground than any standard scale).
All your posts speak of is how you are WILLING to learn, not how you are ABLE to learn. Do you think the girl with two stumps on each hand who learned to play Fantasie Impromptu to a remarkably high standard got there by thinking about what she didn't expect she'd be able to do or making excuses about why she shouldn't expect anything that didn't work at first to improve with further attention? No. She got there by concentrating on what she wanted to achieve and by perservering. That doesn't start from blaming your mood and then walking away from a simple scale, if it doesn't work. It starts from demanding of yourself that you find a different way to think about it, until you have enough mental awareness of the goal to get it right. If you realised how much further development of visualisation would take your standard in playing difficult pieces, you'd definitely find a way to do it in the comparatively easy situation of scales. The problem is that you've started from a desire for scales not to be useful anyway and then based what you are willing to do around that false assumption. This is the point at which no matter how open-minded the teacher is, the closed mind of the student (who has yet to experience the full benefits of scales) will necessarily hinder them from moving further towards their true potential. If you were able to open your mind to quite how useful it is to expect a fantastic scale from yourself at the first execution, you would doubtless drum up the same mental engagement that you already told us you can drum up for pieces (in the sessions where you supposedly can't focus enough to practise an easier scale that requires less advanced visualisation to execute).