IMO there is a simple reason for this. Let me try to explain it with an example from another art.
If we draw a polar bear standing on ice with a carcoal pencil on a warm pastel coloured sheet of paper, the piece of art will have a warm character to it, despite the fact that the bear is living in a cold world. If we draw the same image on a blank sheet of white paper, the image of the polar bear will seem to be as cold as it would be natural for the beast.
Any Moog I have played was like the pastel coloured sheet. Even if I try to make it really angry, it always seems to succeed to be very harmonic and musical. If I set up a sync sound, the Moog keeps some sweetness to the sound and never get’s the aggressiveness of my Arp Odyssey. Moogs sound lovely, because it’s in their genes, electronically speaking, and they are limited to this sweetness somehow.
The A4 is more like the white coloured sheet of paper. If we keep it white, the sound will be clear and distinct. But compared to the Moog, the A4 gives us more freedom to create very different timbres, because we can colour it in so many ways, which are not possible on a typical Moog. The only draw back, if this even can be called a draw back, is that the A4 will not sound like a Moog, a Prophet, or a Jupiter-8 etc.