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I think you're right that it's not that simple. The really valuable knowledge is not the type you get from introductory tutorials, but the type you get from working on production systems.

GitLab concluded that they didn't have the capacity to train developers unfamiliar with their tech: https://gitlab.com/gitlab-com/www-gitlab-com/merge_requests/...

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GitLab is talking about (not) training python people to do ruby work, which indeed needs months of work.

OP is talking about not knowing framework xyz, I'm assuming like knowing JavaScript but not knowing Vue or knowing Python but not knowing Django or Pyramid.

You can be productive with a framework in days / weeks if you have solid knowledge of the programming language.

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