Yes. If that dev wants to work for a company. If he works on a project with other developers chances are she/he needs to know how to work with those frameworks. Do these frameworks help coordinating work between developers? I am sure they are. Do these frameworks help starting a project faster? Probably, yes. Do they make our code cleaner, less complex, run faster or easier to work with or debug? Absolutely not.
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Yes. If that dev wants to work for a company. If he works on a project with other developers chances are she/he needs to know how to work with those frameworks. Do these frameworks help coordinating work between developers? I am sure they are. Do these frameworks help starting a project faster? Probably, yes. Do they make our code cleaner, less complex, run faster or easier to work with or debug? Absolutely not.