It seems you are

Point I: Yeah, this SSHD/password GUI config is kind of surrealist.

II: If I wanted to enable/disable SSHD, probably I would try systemctl start/stop sshd.

III: My 3G provider, Yoigo (Telia Sonera) gives IPs behind a CGNAT. So the SSH daemon is not accesible to the whole world. Of course, there are these WhatsApp teenagers behind the same CGNAT as me, but I don't expect them to know what SSH means.

IV: The same thing with public wifi's at restaurants, transport and the like.

V: Get root access in 30 seconds? Could you post a link to this bug?

VI: I don't know why, but I'm unable to set RSA key authentication on my Jolla. I've got three of four Debian machines, my Raspbian RPi and an OpenWRT router, all of them sharing their respective RSA keys: they work flawlessly. But when it's time to log into my Jolla this way, "Permission denied (publickey)".