> 1. There's always a possibility they evaluated Rust / Go, concluded the agentic code in those languages is less maintainable / productive (for AI agents) than typescript, but didn't spell it out to avoid internet flame wars.

This is a testament of how toxic the fanboys behind some of these language bandwagons became: people avoid mentioning their precious little tool wasn't the top choice to develop a project, because a mundane technical decision can gather so much vitriol from these types that a flame war is bound to happen.