Probably because actual prelinking is deferred in a cron job, so you could update glibc and have the system go south hours after when the cron job executed
Posted Jul 7, 2009 9:46 UTC (Tue) by russell (subscriber, #10458)
[Link]
That doesn't stop the developer from running is manually. I believe the reason "People don't test development distributions" is because the developers don't either.