PWAs, or progressive web apps, are web-based software whose functions are dynamically fetched from the web. Twitter and WhatsApp Web are examples. Their Windows Store editions are essentially UWP Chromium containers that run the PWA. When it debuted in 2011, Chrome OS was intended to be entirely web-based, with a Chrome web-browser running web-based services such as Google Docs or G-Mail. Eventually, there arose a need for a larger software ecosystem, and Chromebook manufacturers pressured Google to add Play Store, and bring the Android software ecosystem to the Chromebook.

A trend over the last couple of years is PWAs, and YouTube TV is the latest addition, with a PWA added to Play Store, replacing the Android app. The PWA creates a lightweight Chromium container without Chrome's bulk, to run the PWA on. It also gives the user the impression of using an app outside the web-browser. The addition of the YouTube TV PWA is a strong indication that at least for Chrome OS, Google is phasing out locally-stored apps in favor of lightweight PWAs, as it rightfully should. Chrome OS was intended to be an evolutionary next-step to PCs with locally-stored software - a lightweight OS for lightweight clients that serve as edge devices, with much of the processing and storage handled by the cloud.