You can achieve something close to that with websites as well though. You can use service workers and caching strategies so that the user only „downloads“ the

You can achieve something close to that with websites as well though. You can use service workers and caching strategies so that the user only „downloads“ the boilerplate - i.e. page logic, JavaScript, html structure - and (current) content of your website once and only downloads new or changed content. This is the whole idea of the offline-first model that’s originally made to enable users on mobile devices with spotty internet connections to use your (web-)app without too many hiccups. Granted, this takes some knowledge and development effort, but if your goal is to save bandwidth, it’s absolutely possible. And something more development teams should think about.