It brings Windows processes into play but you can specify particular processes in a slightly different way from the Cleanup Manager in Windows. The Defragmenter is Windows own and that button simply activates that. The Shredder can be programmed to shred a certain location only.
Personally I don't use any of those SecureityCenter features.
This section was set up when Quickclean used to be a standalone utility, that's why there aren't any for following years because it became Qucikclean 'Lite' and was incorporated within the tools interface of SecurityCenter.
It really is a matter of personal preference if one uses those tools or Windows own.