[diminoten]

From the company's perspective, you'd need at least 2 people doing that, preferably everybody. Bus factor of 1 isn't great, and when the rest of the team already knows Python, the benefits of switching to a language everyone knows is huge.

You're also presupposing Python is inferior to Erlang, which I'm not really going to argue about here, but I think we can all agree that Python isn't so bad that the decision to continue to use Python substantially and negatively impacted the org's ability to succeed.