Polyglot isn't a fad. That's like saying, as a carpenter, using more than a hammer is a fad. As a professional, you are supposed to have more than a single tool

Polyglot isn't a fad. That's like saying, as a carpenter, using more than a hammer is a fad. As a professional, you are supposed to have more than a single tool. That doesn't mean you use all of them on every job, but you should have them.