Make it easy to switch accounts in the desktop app.
I have to look after several accounts, sometimes multiple times a day. Currently in the browser app, I log out and (by using a password manager) can easily log into another account. Doing this in the Desktop App is too time consuming, so I stick with the Browser App for now.
Allowing quick and easy account switching, hopefully via integration with PW managers or Apple keychain, would make the Desktop App usable for me.