I've seen apps break in prod where third party libraries had array accesses on indices that didn't exist, or dereferenced nil pointers, in goroutines they spawned. And those aren't the only ways to cause a panic without ever calling the panic function.

Third party libraries have bugs sometimes, and other times our usage of them can create bugs. Nothing like a SIGKILL or anything malicious. That's just the way things are and will be. And breaking down like this in dev can be fantastic!

But when a once in a blue moon issue crops up in prod and all other connections are dropped, the fact that a simple defer+recover couldn't have been preemptively placed on all goroutines is a huge nightmare. I'd even take a "you can add defer+recover for any goroutines created further in this callstack" - it's rare that libraries spawn goroutines, I'll already know which ones to trigger that behavior on