> Well yes, hopefully you know what you are doing when you reference a source generator

I don't think there's much that's scary about generating source code in general. If it's self-contained and you have to actually call the generated code to use it, it's not really much different than any other code. But the idea of having code A change the behavior of code B is what's horrifying, regardless of whether code A is generated or not. If I'm reading code B I want to be able to reason about what I see without having to worry about some spooky action at a distance coming from somewhere else.