The concept of a Progressive Web App is enticing: an app using web technologies that’s inherently cross platform (since it runs in a browser) and acts like a native app, even working offline. Support in traditionally locked-down platforms like iOS means that PWAs can give users the freedom to install apps without having to go through Apple’s App Store.
Attempts at similar things have been made before, notably the infamous Electron allows developers to easily create cross-platform apps by essentially bundling the browser in with the app. This has its drawbacks, though. Browsers have huge attack surface so it's important to keep them updated, but many Electron apps ship outdated versions, leaving those apps vulnerable.
