@Saminam That is incredibly helpful, thank you so much. I'll look into everything you mentioned in detail and try to understand it as best as I can.
I'll most probably come back to you for some help if that's alright, as this appears to be the kind of topic where learning more about it results in more questions popping up than are being answered.
Do you have any reading recommendations on visualisation (and imagination) introducing the subject matter to the uninitiated? Where could someone looking to develop a basic understanding of the science start?
The V vs. M distinction made intuitive sense to me, but I'm definitely prepared to introduce a lot more nuance (or even throw it out the window entirely) if it turns out to be inaccurate or based on false premises.
Visualisation depending on our memories makes a lot of sense to me, I guess my intuition was that there is a distinction in the type of memory utilised, one being 'visual', whatever exactly that entails, and one 'factual' or perhaps 'propositional', directly expressible in language. I'll definitely look into the science of memory too, there is probably some misapprehension on my part there as well.
Regarding your last paragraph, how can I understand what exactly aphantasia is, or what exactly it is people with aphantasia don't have / are not capable of doing, taking your point into consideration?
I would have thought that people in general actually would be capable of conjuring up an image of something in their mind, while I personally can't.
E.g., I can think of the Japanese flag and how it looks conceptually, I can remember 'there is a red circle centered on a white rectangular background' and have some sort of 'feeling' of how that would look like, but I can't actually 'see' it. So my guess was that in general, people could actually have an image of the Japanese flag in their mind without the actual visual information traveling through their eyes into their brains. But again, it seems like it's very easy to be under some misapprehension with these kinds of topics, as it's so very difficult to describe the character of one's thoughts/imaginations.