I came across an article (MS documentation) some time ago containing a full comparison chart of the supported features and functionalities in SharePoint between SharePoint Designer, C# and Visual Basic. I can't recall if it was on MSDN or TechNet, but I can't seem to find it. Due to business requirements and the limited customization provided by SharePoint Designer, I need to develop custom solutions (workflows, transferring data between SharePoint lists and external SQL databases).
This isn't exactly my IT Manager's area of expertise whom is convinced all I need is SharePoint Designer. I need this specific article to prove my point and justify why I need this software. If anyone can direct me to this article, I would really appreciate it.