Optimized duplication in CASO environment

Hi

I’ve just setup  BE 2014 optimized duplication In CASO environment.  I created CASO server with dd and MMS with dd as well since it is requirement for opt dupe.

I created backup job that use dd on CASO server and are replicated to MMS server.

After that I read the best practices document  and it says "…Do not run jobs that use a deduplication disk storage device on a central administration server. Instead, assign backup jobs to managed Backup Exec servers and select a Backup Exec server pool as a setting for the destination device ". …..

My question is – why running jobs that use dd on CASO server is consider  as wrong configuration ??

Thanks

Jurek