Because that's a way less obvious command.

that’s a bit slow typically

so install ruff?

sure, I do, I was responding to someone who asked why not use uvx to run ruff

The native integration offers persistent configuration, caching, and project-aware behavior that uvx (which just creates an ephemeral venv) doesn't provide.

I would imagine that a person who is seriously concerned about any of that would just install a standalone version of ruff. Given the existence of uvx, this addition seems like feature creep to me.

It's not bundled. `uv format` will use the `ruff` binary and more or less run `uvx ruff format` behind the scene.

It's this "more or less" that is a problem. More complication, less reliability.