Choice quote from a real world example:

The moral of this story is that “flexibility” is rarely desired in programming! The less a program will accept/the less a program will do/the less options and preferences it has, the more usable it is/the more understandable it is/the more stable it is.

When designing a program, you’ve got to make some tough decisions .. and when you really can’t decide if this is something your users will need someday, err on the side of leaving it out.