[kinlan]

The current way that we see the banner is that it is the equivalent of an App install banner for web sites that meet the rough idea of what a Progressive Web App is and would be something that you would want to install or act like an installed app on the system.

The thought at the time of the change wrt to the fullscreen or standalone is that to get that app like treatment in the OS you would expect it to launch as an app would on the system (sans-url bar).

Note: we are also thinking of ways to get the URL bar back to the user when it is launched standalone or in fullscreen. It's a complex UX problem but we want to get the best of both worlds.