I have worked as a compiler engineer for 10+ years. Maintaining a high performance JIT compiler for a Haskell inspired language used in production by large corp

I have worked as a compiler engineer for 10+ years. Maintaining a high performance JIT compiler for a Haskell inspired language used in production by large corporations around the world. And I have never had a need to use attribute grammars. I am sorry to say this but almost all compiler PhD work I have seen or read about is not useful for writing real production compilers.