And I wouldn't overestimate a language's popularity. It's mostly a social phenomenon and rarely has anything to do with technical prowess.
I agree that integration with the separate LLMs / agents can and does accelerate initial development. But once you write the integration tooling in your language of choice -- likely a few weeks worth of work -- then it will all come down to competing on good orchestration.
Your parent poster is right: languages like Erlang / Elixir or Golang (or maybe Rust as well) are better-equipped.
Take for example something like being able to easily swap models, in Python it’s trivial with litellm. In niche languages you’re lucky to even have an official, well mantained SDK.