>Linux is one of the last strong defenses for the idea that people should control the computers they own.

Please run Kate/Kwrite as root and then we will talk on the topic. Or pipe password to ssh

That's the good thing with open source. You can theoretically fork it and remove what prevents you from using Kate as root.

You dont have to use that software. Who even would? You're an adult, presumably, so use vim.

Kate/Kwrite will ask to escalate to root if permissions are not sufficient. If it's not available to you, that's because your distro patched it out.

For ssh - sshpass.