Zig has a "Zero AI" policy. Bun has had to maintain an internal fork of Zig with various AI-assisted fixes that have resulted in real performance and stability gains for the runtime. Its, arguably, a decent reason to decouple from Zig.

The challenge is: They already were decoupled. They've forked Zig. If your desire is to make a bet on generated code and reasoning as the entire future of software development, as Jarred and Bun have; why would you chain yourself to the crazy political nightmare that is the Rust project, when you've already got a language & runtime that's treated you well, is forked, your contributors know well, etc? Literally: Why can't these issues be fixed within the context of BunZig? Why don't they want to own the whole stack?