They wouldn’t be human. So much of us is built around our lungs, including our ability to speak that anything adapted to survive without them would be as different from a human as a human is from other lung-less animals. Even if they were more intelligent, they would not look or act remotely like a human.
So theoretically if we terraformed the Earth we would be free to genetically engineer humans to survive without lungs?
They wouldn’t be human. So much of us is built around our lungs, including our ability to speak that anything adapted to survive without them would be as different from a human as a human is from other lung-less animals. Even if they were more intelligent, they would not look or act remotely like a human.