People have replied to your questions, including Dr. Tam, in the other thread regarding extractions. You just aren't getting the responses you're looking for. I think Dr. Tam summed it up perfectly in his response below:
It sounds as if you have some issues with the trusting professionals. It may have been because of past experiences, but the key is to find a professional that you trust this time around. We have many patients who have 4 premolars taken out and opt to have their 4 wisdom teeth taken out at the same time. They actually prefer to go through extractions once, rather than having to go more than once. They are usually under anaesthesia, but not the same kind of sedation as general in the hospital.
Our patients come to see us with various ideas about treatment. Unfortunately, there are limits to what we can do because of biology and with Invisalign, sometimes experience. I would be more worried about orthodontists who change their treatment plans simply to suit your requests, when it may not be in your best personal interest.
Good luck with your search!