A lot of the time, I just want them out of the way so I can see more clearly all the user created presets, or to be able to browse them quicker. I use a lot of keyword tags to group them together in a-z search results, but I’d rather just hide all factory presets, AND to also be able to add presets to the hide list - for instance, factory presets of 3rd party plugins.
+1. Good ldea.
Regards. 
Thank you
+1
HALion and Groove Agent already have this feature…why not Cubase?
+1