Oxc is not the first Rust-based product on the market that handles JS, there is also SWC which is now reasonably mature. I maintain a reasonably large frontend project (in the 10s of thousands of components) and SWC has been our default for years. SWC has made sure that there is actually a very decent support for JS in the Rust ecosystem.

I'd say my biggest concern is that the same engineers who use JS as their main language are usually not as adept with Rust and may experience difficulties maintaining and extending their toolchain, e.g. writing custom linting rules. But most engineers seem to be interested in learning so I haven't seen my concern materialize.

The goal is for Vite to transition to tooling built on Oxc. They’ve been experimenting with Rolldown for a while now (also by voidzero and uses oxc) - https://vite.dev/guide/rolldown

Depends on how conservative their minifier is. The more aggressive, the more likely bugs are. esbuild still hits minifier bugs regularily.