Because it has been tested on a wide range of browsers and devices and your custom CSS might not.It's exactly the same as"you might not need jQuery stuff".Yeah you might not need that but again,how many of us test our code on 50+ devices ,browsers and browser versions? So yeah you might need any tool that has a comprehensive test suite.
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Because it has been tested on a wide range of browsers and devices and your custom CSS might not.It's exactly the same as"you might not need jQuery stuff".Yeah you might not need that but again,how many of us test our code on 50+ devices ,browsers and browser versions? So yeah you might need any tool that has a comprehensive test suite.