[taeric]

Careful with this wording. They avoid shared memory mutations. They don't necessarily change data races. Rather, they just change them since, by definition, every edit is now creating stale data.

At large, in distributed software, this is a distraction. Since most passing of messages around from one distributed piece to the other was already doing a copy across mediums. Such that sent data was already immutable from the senders perspective. (Granted, the preparation step can have you step on your own feet.)