It is said that if you can draw freehand a perfect circle, you are certifiable. I would suggest that if you can draw freehand a perfect anything, you are probably one of a kind. That would be something worth exploiting in this contemporary world of busy businessing, if that is what you are into. Is perfection subjective? I suspect for a lot of people, it is. For the rest, it is simply a necessity. That need means there is no time to debate on the merits of perfection as opposed to its demerits.
The wheel is probably one of the better circles that was ever invented. As was the method in a mandala. If you are not clear on what a mandala is, it would perhaps be a good thing to investigate. Ask the Buddhists about their why. Perhaps the Buddhists also know why pandas have black circles around their eyes. It is worth asking.
Circles are continuity. They are consistent. Circles are not cycles. Cycles are their own entity. They depend on themselves for their shape. A circle is a definite shape. Anything less than perfect for a circle is not good enough. You cannot call a 99.9% round, a circle. A circle is 100% round. 360°, even, if you like.