Not just rclone, but it seems that so many things are moving away from using the ssh_config; I have things setup to "just work" for so many hosts with OpenSSH, and having to individually configure a half-dozen programs that build on top of SSH is a pain. Sometimes it's because they use paramiko, other times it's because they want to pass their own configuration options to ssh that mess things up.

Sometimes you can manage to get things to use the ssh_config again (e.g. with xpra you can do "--ssh=ssh" but other times I've not yet figured a workaround.

Can you name these programs? I want to add them to my 'painful' list.

I only use programs for which I've found a workaround due to the pain, so I can't list the ones that I don't have a workaround for. TBF two of the programs (emacs tramp and git-annex) I use regularly actually mostly respect ssh_config by default, but they override the ControlMaster by default (to do their own connection muxing) which requires me to do an extra authentication step.

jetbrains products. I think they've improved their situation, but it's still a little quirky