The reason why it is a good theme is that this story can fully show the difference between the two generations of machine times. Chappie was originally just an unconscious robot code-named 22, but with the efforts of its "maker", it evolved to A robot that can learn and evolve, this change is enough to support the entire plot, but under the director's somewhat confusing plot arrangement, this change is downplayed.
The last part of the film made me feel terrified. The scientist who was the creator of Chappie eventually became a robot, and lived in seclusion with Chappie and Chappie's "mother" in a corner of Johannesburg. This may be a metaphor for the end of the human era. But this atmosphere is still ruined by the songs at the back of the film.
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