That’s a great question. I think it’s so interesting reading your experiences with different types of blind students you have been helping and their ability to interpret graphics, some better than others. I do think that having had some vision in the past really make a difference. For those who are blind from birth like myself, I feel like our brains never got that learning opportunity and we are lacking that understanding since we have no reference point for certain things. I do much better with 3d models as you discussed. I had to take organic chemistry in college for my human biology major and the only way I could grasp that was 3d models. I didn’t have any tactile graphics to even use then but even if I did, I am sure I would not have found them helpful.
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I would expect the factors which influence success in tactile graphics understanding to have been investigated in research. I don’t know whether the research has reached the point at which it would be useful in crafting a tactile graphics tutorial for the Monarch, however. We would need to ask someone who works in the relevant field, probably cognitive science.