The facts as presented from the Bun side show a lack of technical merit for the rewrite. This shouldn't be surprising, because rewrites are bad engineering, in most cases.
The Bun project was started in Zig by someone with a lack of experience using the language, despite the massive scope and complexity, and was effectively a rewrite from another language in the first place.
From the Bun post:
Bun started as a line-for-line port of esbuild's JavaScript & TypeScript transpiler from Go to Zig.
Then, a few years later, the entire codebase was thrown out to do another rewrite in another language.
What is there to address?