Scientifically speaking, creating a humanzee would be no different from how we've created Ligers and Mules. So why haven't we created a humanzee yet, knowing it's entirely possible and super easy?
Many say it's an issue of morality. But why would it be, considering a humanzee would be neither human, nor chimp. What would be a worst or best case scenario in this situation? Being the eternal optimist that I am, I envision a friendly pet-like companion, like a dog, but much smarter. It's not like it would be in a constant state of pain, like some kind of groaning Frankenstein - nature doesn’t allow animals to live in perpetual pain. Perhaps they could even be trained to do our work for us? Like picking fruit in the fields? Or factory work, or other jobs humans don't particularly like doing? For thousands of years we've been using horses in similar ways - I don't see how a humanzee would be any different.