Earlier quoted context omitted.
> Yes, the permanent world record is a little unfortunate. Why? The longer you keep records, the less likely it is that you can exceed the previous record. Why would we expect javelin throws to get longer over time?
Attainable goals are more motivating and meaningful than unattainable ones. It's in many ways a different event because the equipment is different, so why should a record for a different event stand.
That's a completely separate concern. Once records are established for the current event, you still expect them to be more or less permanent. Turning in the best performance in all of history is not an attainable goal. You can't expect it to be one.