What is the use of "Add view from template"?
Modules give you some templates to work with instead of having to figure out the dirty details yourself.

For example:

You have the image module installed, so they give you a gallery template to work with. of course you're not obligated to use it but it's there.

If you download the Calendar module it will give you a bunch of templates as well. 



There are several modules that give you templates to work with. And if you write your own custom modules, you to have access to create templates for users to use if you wish to.