I think the language doesn't matter.
In the end we should focus more on the libraries, communities and the ecosystem. For example, Python is a poor choice for web dev (slower adoption of new web techs in the community, not statically typed, etc), but the only (ok, an extrapolation, but you get it) viable choice for data science.
As for Go, a pretty solid choice for web dev, but certainly not all full stack devs should learn Go, that's non-sense.
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I think the language doesn't matter.
In the end we should focus more on the libraries, communities and the ecosystem. For example, Python is a poor choice for web dev (slower adoption of new web techs in the community, not statically typed, etc), but the only (ok, an extrapolation, but you get it) viable choice for data science.
As for Go, a pretty solid choice for web dev, but certainly not all full stack devs should learn Go, that's non-sense.