Well an app store let's people... use it.
Look at UNIX. UNIX systems are great. They have produced great benefit to the world. Linux, as the most common Unix-like OS, also does. However, most people do not run any of the academic 'innovative' distros. Most people run the most commercialized version you can possibly think of Android and iOS (Unix variant from Apple). It takes commercializing something to actually make it useful.