s.version will get you the AppMeasurement.js version, which is technically different from the "Analytics Extension Version" that I mentioned below....
There's also a lot of "nesting" when it comes to version numbers 🙂
As for your question "maybe where it will be used?", this would differ based on companies... if this is coming from an old requirement, and carried forward to a new implementation, perhaps its a good time to evaluate how and if it's being used.....
We don't track this ourselves.. but I believe some companies do this do that if there is a problem, they know what version to roll back to... but with a full log of Revisions in Launch (and even before most companies should have been using a Code Repository and proper branches) being able to roll back to a previous code base should be easy to achieve based on recorded dates and traceability....