OS / App parity
Acheive functional parity across all OS and Apps within an individual OS
macOS:
Mail, Drive, Pass are all missing a 'Settings" menu option (cmd+,) VPN has it.
Menu bar - Drive and VPN minimize to the menu bar, Pass keeps it's dock icon. Mail has no menu bar icon option at all
Update checks - Only Drive on macOS has an option to check for updates within the app.
Specifically looking at macOS - across the different app teams they've implmented this functionality, that just needs to be shared.
Across OSs
Bring each OSs particular app up to the same level. Drive on macOS is not up to Windows for example.
Adding this as a specific internal roadmap item and reaching it will then give all the teams a baseline to work on new functionality to be included at the same time!