on 2: The biggest advantage is, that you can benefit from common knowledge when setting up a team of devs. Frameworks/Libs like React/Ng/Vue/etc. do bundle a set of patterns, best practises and popular libraries, and those are usually known with developers. And if not, there is already a big body of learning-material available. So getting up-to-speed is much more convenient for popular frameworks than for custom-build tools.
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on 2: The biggest advantage is, that you can benefit from common knowledge when setting up a team of devs. Frameworks/Libs like React/Ng/Vue/etc. do bundle a set of patterns, best practises and popular libraries, and those are usually known with developers. And if not, there is already a big body of learning-material available. So getting up-to-speed is much more convenient for popular frameworks than for custom-build tools.