Development time needed to create desktop apps (for Windows, Mac and Linux) given that there's already an existing webapp:
- using Electron: 1 month
- using QT: 2 years
- using Electron: 1 month
- using QT: 2 years
(by reusing the chrome context, your memory usage wouldn't grow unnecessarily for each new slack/spotify/whatever you open).
To push Chrome OS (where they will still be available) and to vendor lock-in people with Android apps.
Progressive Web Apps is where it's at.