alt Hacker NewsOne of my hobbies while at Google (2010-2015) was to watch the multiple failed attempts to get rid of Borg Config Language and actual Python in Blaze. It took a lot of work until they eventually succeeded. You're probably underestimating the rigor, the pain, and also the value involved in cleaning those things up: being able to cleanly operate programmatically at scale in the Google monorepo is extremely necessary.
(This is also why I don't trust configuration languages built by people who _didn't_ observe the years of pain. Cue and jsonnet are notable projects that were able to incorporate a lot of lessons.)
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I can appreciate the pain of actually getting things through in a large (100k+ people) organization.
What do you consider the be the justification for three separate implementations of the same build config language? Genuine question. I am not doubting the need for the DSL itself.
Also, I think the Rust version was built as a side-project, then handed off to Facebook.
With regards to Fuchsia… I used to think building a new OS from the ground up was madness. Now I think _not_ doing that eventually is madness. I'd be a lot happier if Zircon and Fuchsia were done in Rust though…