The vast majority of devs can be (some definition) of productive in general languages like C#, Java, Python etc in a day or a few. As in, able to grasp code, sp

The vast majority of devs can be (some definition) of productive in general languages like C#, Java, Python etc in a day or a few. As in, able to grasp code, spot and fix logic faults. That is far from accurate for more left-field languages. Should every new hire spend three months meditating and becoming one with the functional gods? Seems a bit silly, almost as silly as trying to hire a programmer that is a fit into the company, and knows the relevant domain AND programming language/ paradigm as dictated by someone long gone.