Yep, it's almost as much've a shit-storm as Amazon's internal tools - which are rife with errors and pushed by Amazonians because "open source is shit" (verbatim from a lead engineer).

That seems a bit inflammatory. Anecdotally most of the people I've interacted with especially like open source. My team is increasing our involvement in the open source projects we use.

A lot of the internal tooling is due to legacy and inertia. There's 20+ years of history, and so much has been built and continues to be built that it's enormous investment to steer a different direction. Incremental improvements have higher reward ratio. But people do want better a better development experience, especially w.r.t. idiomatic language tooling.

That being said, initiatives are brewing for that "enormous investment".