I believe by default the busybox syslogd rotates files at 200KB and keeps a single backup.
Before I turn syslogd on by default on all my systems, is there something other than 400KB of memory at stake? /var/log isn't on persistent storage, so no issues with exhausting flash write cycles or anything, performance impact is minimal...
Maybe just not judged worth it because the log won't survive a reboot?