Failure to take off means that instead of getting a long tail of things that work, you get a smaller island of reduced functionality, even if that is enough to

Failure to take off means that instead of getting a long tail of things that work, you get a smaller island of reduced functionality, even if that is enough to keep you using it. It doesn't have to be the goal of the project or the author, but there are real advantages to achieving a takeoff, even to the users of a product.