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One thing that is not generally considered is that while it's quick to switch language, it's not true for ecosystems.

Yes, you can be productive in python syntax quickly, but I've seen enought people failing at building a sane python project I know that other things take more time: libs, tooling, workflow, typical error, debugging, deployment strats, etc.

So you do want at least one specialist in the team to drive the generalists.

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That explains my view that it takes months to learn a language whilst others say it takes days.

You can't be proficient in a language until you can write programs in to and that includes being able to build and use common libraries, debug in it and use common tools well.

I get what you’re saying. But, it depends.

Someone who has been learning for 20 or 30 years probably can pick up a new ecosystem easier. “I can learn it in a day because I’ve been learning for 30 years”, etc.

But it is still not a day.

I have done this for 30-40 years. Yes I can guess better than a junior but still takes time.

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