That is a nonsense comparison on several levels and I think you know that. Either something is possible or it isn't, and if it is possible in some cases but not in others, there needs to be one or more variables that cause that to be the case. Your analysis, as presented, was clearly incomplete because countless people with aphantasia provide contrary testimony.

That's why I suggested that you might be misunderstanding what it's like for people who are -- as far as this topic is concerned -- NT. Art is hard and it requires an immense amount of knowledge and practice, and many (for this purpose) NT people live their lives bitterly thinking "I wish that I could put on the page what I see in my head, but I lack the talent to do so". Generally speaking, they are wrong, they just haven't put in the work like the artists have -- including the much greater work disabled artists have -- but it goes some way to demonstrate that even for the able it is a long and difficult and discouraging process to make things that you can imagine other people finding presentable, though you may never even if you are quite good. You spoke a few comments ago as though mental images are themselves a superpower that elide the need to actually learn how to draw when it's genuinely nothing more than an ability to generate mental rough sketches at will that are significantly less stable and consistent (and therefore less useful) than an actual sketch.

Your stick figure claim is false, that is all.