I don't see why that should be the case. The only reason software is getting focused on first is:

1. Software devs are obviously going to have a better idea how to apply AI to software development compared to other fields. So of course the coding tools are going to be the first things made.

2. Formal verification makes the problem easier by allowing for iterative feedback (compilers, proofs, etc.)

The second argument is, I think, somewhat valid, but ignores that a lot of other professions also have similar verification systems even if they're a bit less rigorous. The first argument just explains why things are the way they are now, it's not indicative of the future. I don't want to fall into the trap of thinking that other jobs than mine require less cognitive horsepower or whatever, but I don't see what's particularly special about other jobs if it can do hard STEM stuff.