You made a web site that displays a document. Not a web app. Web apps, like native apps, have a lot more UI state that needs certain patterns and tech to manage

You made a web site that displays a document. Not a web app. Web apps, like native apps, have a lot more UI state that needs certain patterns and tech to manage them properly. Many devs can discern the difference and use the correct tools. Some do reach for the wrong tool but it's not the tools fault.