Is God not perfect? Would He create anything un-perfect? In reference to the word "good", what did Jesus mean when He said there is none good but the Father?
This exploration of the word "good" should continue, don't you agree? We're just touching the surface, amen?
I agree that God saying creation was "good" is no different than saying it was "perfect" in this context, however, perfect is a relative description not an absolute description. Blue would be the example of an absolute description. If I say something is blue we know exactly what that means, it means the wavelength of the photons being emitted from an object have a wavelength of ~460nm. Tall, however, is a relative description. Saying something is tall without any context is meaningless. How tall is tall? 5 ft? 10ft? 50ft? 1000ft? 25000ft? It depends on the context. People? 6ft is tall. A mountain? 23000 ft. Tall means that something is of greater height than average.
If something is absolute, that means it doesn't change depending on the situation. Blue is always the same range of wavelength of light, it doesn't change. Tall, however, does change depending on a situation. A 7ft person would be considered tall, but a 7ft building would be considered short. Likewise, perfect also depends upon the situation. The perfect car for a college student would be a cheap, used model with very basic features and good gas mileage. However, such a car would not be perfect for a business trying to impress clients. A business trying to impress investors and clients would want an expensive and sporty car that is new or very close to new with lots of luxury features. Something can be perfect in one situation, and completely inappropriate in another. Perfect simply means that it serves its intended purpose.
The world is perfect because it serves exactly the role God wanted it to serve. God has always intended for things like death and pain to exist. They are necessary traits of the universe. The universe would have to be completely different in order to not have any of these alleged "imperfections" while still supporting life. Earth was never meant to be Heaven, it was meant to be a place where humans could experience both good and evil and make a choice to obey or disobey God, and it does that very well, perfectly in fact.