I guess hiring a developer who knows rails or even laravel can easily pick up with phoenix.

If the only metric you care about is "scaling a dev team", use JavaScript. You're welcome.

I am not even sure that is true. Only if your main criteria is available resumes where the programming language is listed at all. JS has probably upper 90% there

Did I say it was?

by hiring people without the expectation to be already proficient in it, as long as they are willing and capable of learning it in a reasonable time

Hiring is hard enough and you want to add this additional complexity? Okay.

I would argue that hiring people expecting them to be fully proficient in all your stack is a much worse complexity to add

I don’t hire developers who are tied to just one framework. I prefer someone who has a solid understanding of a platform but also a mindset to learn new technologies. You don’t need a large team, just one or two talented developers on a good pay package can be more than enough, and in my opinion, it’s worth it.

1. Hire good developers

2. Teach them Elixir

3. Profit

> 1. Hire good developers

Are you giving this advice to every company in existent? Think about that for a second.

It's better than the advice of only filtering for developers who know language X.

Did I say or imply that?

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