Humans need problems to solve. Without those problems, there's nothing to exercise the mind and body with. If you define good and bad as what is desired and not desired in your life, there is definitely plenty to chew on.
This is why perfection can be such a trap. If you define perfection as the absence of bad, evil or the undesired, then what happens when you arrive? Is perfection boring? Is Heaven dull?
From Illusions, the Adventures of a Reluctant Messiah by Richard Bach:
"I'm not sure I want to be perfect and finished. Talk about boredom."
"Look at the sky," he said, and it was such a quick subject-change that
I looked at the sky. There was some broken cirrus, way up high, the first bit
of moonlight silvering the edges.
"Pretty sky," I said.
"It is a perfect sky?"
"Well, it's always a perfect sky, Don."
"Are you telling me that even though it's changing every second, the sky
is always a perfect sky?"
"Gee, I'm smart. Yes!"
"And the sea is always a perfect sea, and it's always changing, too," he
said. "If perfection is stagnation, then heaven is a swamp! And the Is ain't
hardly no swamp-cookie."