I'm genuinely curious which language you see as having a better development time. I don't mean that as arguing, I'm actually curious. I don't know much about Go but I just began learning it 2 days ago. I'm already 50% of the way done through a really nice TUI app, and I haven't even touched the docs.
To me at least, it feels extremely productive so far.
When leaning on libraries pushing what's new in computer science, like certain facets of machine learning as a prominent example, which generally aren't found outside of the Python ecosystem, certainly. But head-to-head on well-trodden computer science paths, Python doesn't stand a chance.
My own experience (I'm not the author) is that the investment required to reach the point where Go can be a "hammer" as in this case is lower (usually significantly lower) than with "faster and more expressive" languages.
We're at complete opposite ends of the spectrum here -- how that indicated to you that I meant assembly...