Do you have any programs other than those made by your operating systems designer on your computer? You can’t even buy a new computer from the store and say yes to that statement.
This is because an OS is platform for all other tools to attach to. It is your Christmas tree, and each program you install is another ornament placed on the branches. Without the back bone, without the tree, your decorations would be disorganized and scattered about the floor. Furthermore, each computer, each tree is different. I tend to go the route of the little Charlie Brown tree with fun ornaments of no common origin. Most likely your tree looks far different than mine because you value different things. The programs you find useful on your computer are not necessarily the ones your children or siblings find useful.
This same principle is the case with SharePoint. SharePoint acts as the backbone to your intranet, on which everything is organized. Each additional web part that you add is another ornament on the tree. Each company is different, so it would be impossible (and far too expensive) for Microsoft to imagine and include every bit of functionality needed by every business around the world. Here enters Microsoft Partners. Microsoft Partners offer a wide variety of SharePoint add-ons that cater to the vast needs of global businesses. These add-ons such as enhanced document viewing with VizIT sp, advanced document importing by Knowledge Lake, or advanced search by SurfRay can be chosen a la carte to fulfill your business needs. If there is something specific that you are hearing your colleagues ask for from the MOSS installation but do not know of a solution OOTB, third party solutions such as these may be your saving grace.