but it has to a large extent. 20 years ago I did linting by hand, efficient memory allocation was a key skill for a developer, and now that's all taken over by computers. Going further back, I used to be able to beat a C compiler in optimising assembly code, which now I wouldn't even know where to start. Even further back, things like compiling and linking were done by hand.
Most developers today use automated builds, packaging, test runners, app genertors and so on.
Automation in software development is already there, it's been present from almost day 0, but it has so far been aimed at assisting humans, not completely replacing them.