Maybe a different way of looking at it might be like this.
Imagine your 6 year old son climbs on his bike for the first time. He's got his helmet on, starts to pedal and goes, and goes and then he wipes out.
He says "Dad, I am no good at this!".
You say "No, son, you were perfect!"
Does that mean that your son is the worlds most perfect bicycle rider? No. It simply means he "perfectly" tried riding his bike for the first time.
Does that make a bit more sense when trying to understand the concept of "perfect"? It doesn't mean unchanging or finished.