A programming language spec is expected to be unambiguous. A compiler is expected to be deterministic. There are multiple ways to different outputs when compiling (optimizations, etc) but those are also meant to be well defined and deterministic themselves.
AIs are stochastic/probabilistic machines. Their big potential is in how they take malformed, incomplete, ambiguous inputs and come up with valuable and usable solutions.
If everyone needs to give them roughly the same set of instructions to get good results, then those instructions should be built in.
Good defaults are expected in pretty much every other tool.
And “You just have to set it up carefully and properly” is pretty much saying that the defaults are never good enough.