I don't think this is there to satisfy "need".
But "automation" with this could legitimately (well, mostly) be based on a git repo with an s3files mount inside it. And a cron job, if you really want to get fancy.
Files which aren't DNS keys get ignored by Route 53 Files. So you could absolutely have a git checkout and update your DNS with 'git pull'.
Files which aren't DNS keys get ignored by Route 53 Files. So you could absolutely have a git checkout and update your DNS with 'git pull'.