https://en.wikipedia.org/wiki/Robert_Wise
https://en.wikipedia.org/wiki/The_Day_the_Earth_Stood_Still 1951
https://en.wikipedia.org/wiki/Harry_Bates_(writer)#The_Day_the_Earth_Stood_Still
https://en.wikipedia.org/wiki/Farewell_to_the_Master (1940) In the original story, it is revealed that the humanoid alien is from an AI-Robotic run world. Presumably, the robots have allowed some biological humanoids to coexist with them. The humanoid alien was sent as an emissary to the Earth, under the authority of the G Robot who accompanied him. This version of story might have been deemed too disturbing for the movie. It still might be unsettling for some people today, because there is a concern that this world could eventually be taken over by AI. Would most or just some humans still be allowed to coexist?
https://en.wikipedia.org/wiki/Star_Trek:_The_Motion_Picture 1979
https://en.wikipedia.org/wiki/Star_Trek:_The_Motion_Picture#Plot The ending depicts an AI & human merger, but perhaps the mans DNA and consciousness was merely absorbed by the AI entity.
However, this wasn't a Borg like assimilation of human biology. It was more like a newly evolved life form an digital entity combination.
https://memory-alpha.fandom.com/wiki/Borg In contrast, the Borg likes to assimilate biology as part of its conquest agenda.