Reasons to not allow sync.
1. Potential size of library. Larger libraries can cause performance issues with the sync client. It's gotten better over the years, but I think it's still recommended to keep under 300k files. So this is a consideration.
2. Same as 1. But potential for one user to easily wipe out larger libraries, or accidently drag and drop folders around causing confusion :P.
3. Data leakage. You don't want someone's laptop to get stolen and have access to all your files. Obviously device encryption and other means can help here, but they may not have that, so they prevent mass leakage by preventing syncing.
4. Metadata. If they utilize metadata for files the sync client doesn't support it yet, so they may just not allow it to prevent problems / confusing. (you can still do read only when metadata is in use)
5. Network storms from someone uploading 5 gigs of files, and if everyone is synced, you now have a network spike for all clients to get this file updates. Obviously you could put sync client limits in, but depending on number of clients etc. this could be difficult. But it also assumes you have large libraries shared among everyone. Would be an architecture thing from company to company.
Anyway, these are 5 big things I can think of off the top of my head. Hope it helps!
