Except it's not something you can really accurately assess before you start working somewhere.

Are you serious? This is the kind of thing you'd ask a clarifying question on and get information back immediately. Further, the huge overreaction from Hegseth shows this is a fundamental disagreement.

In what business is everyone in the company going business class?

This reads as if it isn't trivial to have an HTTP API for your public API in Erlang/Elixir, which is weird. Sure there isn't an included HTTP API for Erlang processes, but why exactly would you want one? They're not for the public internet, as their an implementation detail of your system. The majority of what they're capable of just isn't relevant to the public internet.

> Lets count the number of comercial sucesful released games that don't use mutability or object orientation.... > > I can't find any.

They use it, but the best tend to minimize mutability. And as for object orientation- merely 'having classes' is not the same thing.