I might be wrong, will try to dig deeper, but to me it seems like this is for removing third party crapware that might affect your Chrome experience (toolbars,

I might be wrong, will try to dig deeper, but to me it seems like this is for removing third party crapware that might affect your Chrome experience (toolbars, ad-injectors etc), not for removing Google's own stuff. So kind of makes sense to be an optional standalone tool.