I agree that a good developer should have the foundation, knowledge and skills related to basic development first. But there's absolutely nothing wrong with using a JS framework. Majority of developers code for a living, for a business, where productivity is always measured. A decent framework will usually aid most solid developers with their productivity. In 2018, if I see a developer not leveraging frameworks or whatever tools are available to them, I'll question their ability to deliver solutions within a reasonable timeframe.
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