I understand. What's the point of going for the 'record' of an comparatively arbitrary distance? It's like, yeah, Robby Andrews now holds the 1000m American record, but if they so chose to, 10 other people could destroy that record the next day.
I mean, is that really even a record?
You're acting like the 1000 is a totally bizarre distance. It's not arbitrary (it's a kilometer!), and it's raced plenty indoors. If there were really 10 other people who could hold an American record, they'd go for it -- how many pro runners would pass up an opportunity to call themselves "American record holder ..."?