I think there are 2 crucial things that relate visualization (in)ability to lucidity:
1. Remembering the visual parts of the dream, which aphantasic people either can't do at all or can't do good enough. This in turn lowers the dream recall. If you are able to remember how something in your dream looked like visually, then chances are higher that you will both remember the dream itself, it's story and so on, but also what made it unrealistic, which can in turn serve as a trigger the next time you see it. If you can't do this, then you will only remember the story of the dream like I do (I don't even remember how faces of people looked like or what clothes they had, I only remember who they were) and maybe a few visual details here and there. Let's say there was a door in your house in a dream that's not there in real life, if you could visually remember that when you wake up, then you could remember to watch out for it the next time, but if you can't, then you'll maybe be totally oblivious to the door even existing in the dreams, since you can't remember it from the last time.
2. Inability to use techniques that depend on visualizing. This is an even bigger issue. MILD, being one of the most popular and easiest techniques is a great example, for it to be effective you have to not just say the mantra, but also to imagine yourself in a dream setting realizing that you are dreaming, which is maybe even more important than the mantra itself. If you can't visualize, you can't imagine the dream scene itself, let alone this whole process of finding out you're dreaming. Then there's VILD and there is an equally easy and popular technique DEILD, which depends on you remembering visually the last dream you were in and finding out you are dreaming inside that last dream, but again, if you can't even remember it visually, but only as pure information (for example "I remember I was in some sort of a house, but I have no idea how it looked like"), then it's impossible to do DEILD.
Not sure if this is VILD or not, but there are techniques where you imagine numbers are you count them, while falling asleep or imagine going up stairs and things like that, which again, aphantasics can't do. I can count even without using visuals, but since I only see blackness, it's probably way harder for me to retain my focus, than for someone who can fully immerse themselves in the counting process by viewing it.
My personal reason for aphantasia is probably the fact that I have strabismus, which in some cases (but not all) leads to inability to hold the image in your mind's eye. There is the "Image streaming exercise" that helps grow your mind's eye, but it didn't work for me even after months of doing it. Fortunately I have discovered vision therapy which fully solves strabismus (both image streaming and vision therapy work by strengthening your neural pathways), I already have some progress with fixing my strabismus, so I can't wait to try out image streaming once I get rid of strabismus.
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