Making Chucky a robot takes away the charm
We’ve already seen tons of evil robots / malfunctioning / malevolent AI films.
There was a lot more kookiness in having a child’s doll possessed by an evil human via a magic ritual.
Plus, a huge part of Chucky’s personality came from Brad Dourif’s voice-acting.
Essentially, you could replace Chucky in this new film with any piece of state-of-the-art kid’s technology.