The point of an app store with millions of apps is that the store is a buffet. You're not required to take one of everything; if you don't like pork, you don't have to sample any of the pork dishes on offer.
The point is there is such a rich collection of apps available that any time you find yourself wondering if you can get your phone to do some task, the odds are good the answer is "yes." Instead of searching through the store looking at every program, you say "huh, I wish I had an app to log mileage on my car for work, wonder if it exists?" And you go onto the app store, search for "mileage logger," and sure enough, the answer is "yes."
