You do not give details of the research you quote re Russian vs Western attitude displays although I happen to agree with your views IF (and it is a huge if) the pilot has little or no experience of using western displays.
Regardless of which is the better display the task of changing all the western world pilots over to such a different way of thinking would be almost unthinkable. Likely acceptance of such a change would surely depend on the experience level and age of the candidate pilot. Unlearning something SO fundamental would be a huge issue.
Indeed I even wonder how many people used to the western way would even understand your description of the two methods of displaying attitude!