Chromebooks are set to get a bit of functionality that's pulled from other "real" desktop operating systems -— the ability to launch apps on startup. Spotted in Chrome OS Dev 85 by Chrome Unboxed, the company has added the following flag to the OS.
Desktop PWAs run on OS login
Enable installed PWAs to be configured to automatically start when the OS user logs in. – Mac, Windows, Linux, Chrome OS
#enable-desktop-pwas-run-on-os-login
PWA run on login flag