Uber is almost the canonical example of something that should be an app! I need to do a frequent task, I punch up the app, I'm always logged in with my location pinpointed, I get a little live-updating widget on my phone with my ride location, plus notifications and Apple Pay and so on. When my ride's over I'm done with the app. Much more useful than say the "Hilton Honors" or "Ann Arbor News" apps which are literally website wrappers that I use once a year.