I, for one, am glad that it does not generate the entries automatically. At best it would generate clutter that I usually don’t need.
To riff on Breno’s example, the auto-generated locale for user might be:
last_name: "Last name"
In most cases, it would be redundant because I try to choose attribute names that are meaningful. In the case where the name needs to be localized (because I chose a bad name or I because need to localize immediately to multiple languages), I’d still need to edit the file. Generating the entry doesn’t save me very much.
I’d rather have a helper that generates all the stub entries on demand at the moment that I am ready to localize.