I’ve read tons of these and still have no idea if I have aphantasia or not. I can’t understand whether people just have different ways of describing what’s in their minds eye or if there’s really a fundamental difference.
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An old post by Scott Alexander (16+ years, mind blown) discusses this, long before the term "aphantasia" became a thing [1]. There was a debate about what "imagination" actually means already in the late 1800s; some people were absolutely certain that it was just a metaphor and nobody actually "sees" things in their mind; others were vehement that mental images are just as real as those perceived with our eyes. The controversy was resolved by Francis Galton, who did some rigorous interviewing and showed that it really does vary a lot from person to person.
[1] https://www.lesswrong.com/posts/baTWMegR42PAsH9qJ/generalizi...
That said, it really is binary or not whether you cannot see images at all in your head and there are, in fact, some very real downsides related to episodic memory. As someone who realized I was aphantasic late in life, I think it's pretty important to realize you are if in fact you are---ideally as early in your educational process as possible. For everyone else, it's interesting to realize some people have more vivid imagery than you and some people less, but probably that doesn't change very much about your life.
Today, 30 years later, I have vivid representations of calligraphy or art, especially when I fall asleep. I fall asleep within at worst minutes so I cannot really take full pleasure of watching these ilages and during the day I am too surrounded by sources of sound, images etc. to meaningfully repeat the exercise.