alt Hacker NewsI will at least remark that adding a new error to an enum is not a breaking change if they are marked #[non_exhaustive]. The compiler then guarantees that all match statements on the enum contain a generic case.
However, I wouldn't recommend it. Breakage over errors is not necessarily a bad thing. If you need to change the API for your errors, and downstreams are required to have generic cases, they will be forced to silently accept new error types without at least checking what those new error types are for. This is disadvantageous in a number of significant cases.
Indeed, there's almost always a solution to "inergonomics" in Rust, but most are there to provide a guarantee or express an assumption to increase the chance that your code will do what's intended. While that safety can feel a bit exaggerated even for some large systems projects, for a lot of things Rust is just not the right tool if you don't need the guarantees.
On that topic, I've looked some at building games in Rust but I'm thinking it mostly looks like you're creating problems for yourself? Using it for implementing performant backend algorithms and containerised logic could be nice though.