I'll need to add more information, but from memory The issue is that when a file is remotly removed after a local deletion, it will cause the creation of a trial for local file deletion which fail because file is already deleted or something like this.
Prevent this will reduce data consomption as a request won't be started for this. Or at leasst it will reduce cpu usage.
This issue is visible thanks to logcat. But it doesn't have effect on sync