And since Go is so readable, theoretically getting the core functionality out and rewriting it in a more specialized language would be fairly straightforward. And while it's an investment in time and effort to rewrite a chunk, at least you know what you're writing already.

But that's a point made in the article, that Go is also good for prototyping. But there's a few languages good for that, e.g. Ruby which powered a lot of the HN startups in their early days until parts needed to be rewritten for performance / scalability.

But writing a new, unproven product in a high performance, high difficulty language from the get-go is cargo cult; you hope you will need the performance and correctness offered by the language. Meanwhile, halfbaked hack jobs like Facebook and Twitter exploded in popularity and revenue, and while their performance issues gave their developers headaches, at least they knew what problems they had and had to solve instead of guessing and hoping.

> And since Go is so readable, theoretically getting the core functionality out and rewriting it in a more specialized language would be fairly straightforward.

You'll have to rewrite your whole program (or at least factor out the "core" part you care about into a separate binary and talk to it via IPC or network) because Golang has terrible FFI as pointed out by OP.