The first two films are outstanding works. James Cameron is an extraordinary storyteller and world builder.

I like your analysis of the musical motifs, I've seen similar musical theme analysis but not for this movie series. You're almost certainly correct as well. The stark differences between man/machine is the very core of these films. Although when Arnold gives the thumbs up in T2 at the end... it gets me every time and makes me think maybe, just maybe, a machine can somehow evolve to be more human in some ways.

Have you heard of the new Terminator film in production?

https://www.esquire.com/entertainment/movies/a12436404/new-terminator-movie-details/

Evidently its produced by James Cameron and brings back Arnold and Linda Hamilton. Frankly I think these stars may be pushing their expiration date a bit for the full-out action scenes these films usually deliver, but if anyone can pull it off believably, those two can.

Hopefully this will be Cameron returning to the visceral, primal goodness the original two films had in abundance.