This isn't true for 99% of business out there. Almost every mobile app is worse than its website in a mobile browser because most business can't afford a web dev team, an android dev team, and an ios dev team. The exceptions are the few apps built by the mega-corps that have the resources to build a good mobile app. Nobody want's to install some broken app with a fraction of the functionality of the web site, but that's what 99% of the apps in the app store are.