@Michael: that’s absoutely the point: it should simply work without user intervention!
I also have a lot of older people which uses my nextcloud server.
We use it to share pictures of activities which we did together.
And as you said: **it should just work - without annyoing popping up of the web browser ** every time I restart the PC / or relogin the user.
I can’t tell my older people to do that all the time - I can install the desktop client for them, put their login data in that installation and that’s it - from now on it should just work.
I don’t care about end2end encryption if that means you very often have to login via browser and confirm the connection.
At least let me decide and make it an option which I can switch off (or better: is switched off by default)!