It can help with logic bugs (e.g. by encoding the state machine logic directly in the type system, so an invalid transition won’t compile), and things like data sharing issues (Again, type system, tracks sharable objects vs. those that aren’t), but none of those are as “impervious” as the memory safety stuff.

But that all still requires rearchitecting, because if the existing code already follows those rules, it already probably doesn’t suffer from those issues (e.g. I know you can do the state machine type stuff in C# at least)