Compiler output is somewhat deterministic and there is a logical path (even if caused by a compiler bug) and not dealing with it will definitely(!) lead to a broken product. Also at least I rarely read the full output, but I have an intuition, as the structure is consistent, what to look for in the output.

LLM output may or may not be relevant, may or may not tell me something new and by the way it is structure is often hard to quickly oarse for the relevant piece in a wall of text.