I think it's the DSL aspect. For anyone who's every try to write a language, it's not trivial. The people who do PL research in academia are typically mathemati

I think it's the DSL aspect. For anyone who's every try to write a language, it's not trivial. The people who do PL research in academia are typically mathematicians in the comp-sci department, whereas those who do machine learning ( which is "deep-tech") are usually engineers practicing statistics (poorly).