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Given two good candidates, they are going to prefer candidates who are already proficient in their tech stack. It saves time.

Any good company

The keyword here is good. Even then, this isn’t largely true. It is quite hard to convince companies to hire for a skill that you already don’t have experience in. In most cases, there are gatekeepers - those lovely recruiters who don’t know the difference between a computer and a washing machine.

if you're optimising for those then you might as well learn whatever's most in-demand and popular, probably Python. There are plenty of companies that are good enough though, for most you won't even need to talk to a recruiter.

> Any good company won't care what programming language you are specifically proficient in

True, but most companies care more about using popular language rather than an innovative one. You might get hired but you won't be using Nim at work.