They're using it for data transformation.They're long time dbt users, but are switching to SQLMesh because it's extremely efficient, provides a better development experience, and can help them become warehouse agnostic.
There's a lot of hype with ruff, but I've been doing fine with black and autoflake. I have a pretty sizeable project and have never thought to myself it's problematic because it's slow.
Monorepos at scale only really works if you have the tooling and infra to support it. Otherwise, you're going to be miserable with slow builds, pushes, pulls, impossible merge conflicts.
It's surprising how these rash decisions are made with seemingly little thought. You'd think someone so successful would be logical... I guess it's optional.
In general removing the gil will make things slower because you need to make sure things are safe. If most code out there is single threaded, removing the gil may not really have a benefit.