Visual cues only plays a part if you need it to I do not find that they are universal musical tools. I wonder how blind pianist use it?
And yet visual cues are incredibly useful. I would say that of all our senses, we get the most information from our eyes. They are essentially our most "practiced" organ. Thus, it's easier to memorize something visually than it is by any other sense. That's why I said it was more powerful. Now visual memory on its own is worthless in music since music is after all an auditory experience, but to say they aren't universal tools? Can you imagine a world without sight? Blind pianists have to make up for their loss of sight through incredibly sensitive hearing and touch. Their minds work in a completely different way than others in the way the sense the world. Unless you are blind yourself, I really don't see how anyone can speak for a blind person. Humans are very dependent on their sense of sight.
I don't think memory should be graded as what is more useful or not also.
I'm not saying muscle memory is worthless. You need it to play difficult passages. However, muscle memory is most certainly the weakest form of memory and the most likely to fail. You aren't even using your senses. You are unconsciously going through a motion. Now is that really the way music should be made?
As for other forms of memory, I'm evaluating their strengths and weaknesses. Visual memory I explained above. Aural memory, well obviously as musicians, we need a strong aural memory. How the hell are you supposed to play something the way you want if you don't even know what it should sound like? Enough said about that
Now for the most ridiculous of your claims (not that your post didn't have merit, but I found this absolutely ridiculous)
Intellect cannot keep up with rapid pieces, you simply cannot sight read complicated fast music at tempo without muscular memory.
If your own intellect cannot keep up with a piece, you've got practice to do. The human brain can send messages at roughly 1000mph. Human fingers probably travel at around 10-20mph at the fastest (rough estimate). You underestimate the brain my friend. The mind should always be faster than the fingers. Otherwise, you are depending solely on muscle memory and as I explained above, that's not the way to go. It's quite frankly an insult to the music.