This comment could not be upvoted enough. There is a massive productivity level difference between someone who has mastered their expertise in a language's ecos

This comment could not be upvoted enough. There is a massive productivity level difference between someone who has mastered their expertise in a language's ecosystem and someone who is just coming to the language but able to understand the "linguistics"/syntax quickly (usually because they carry some similarity to an already known PL). This is not even considering all the little "gotchas" each language will have. Although, Stackoverflow et al. help ease this a bit.