I would also love to see this, even if it's just with some apps. I have very confused users who don't understand that they have to login everytime, but the password is synchronized. One pattern I've seen is for instance:
Forgot password for nextcloud, reset password. Oh, my rocketchat password doesn't work anymore, reset password. oh, my nextcloud password doesn't work anymore, reset password. Resulting in frustration and people not using the apps. With cloudron it's easy to install the applications, but now it becomes hard on the users