Yes the original distribution doesn't load it by default. But I found that many people come to arc wanting to see how HN runs and it seemed worth reducing one step for them.
On a more pragmatic level, I found I was repeatedly making changes and forgetting to test them with news.arc. Loading it by default was at least a superficial sanity check. But this isn't a big deal. Like I said, feel free to delete the load, commit and git push.