I use those tools already and have been administering Linux/bsd/docker for years. What’s new for me is using it as a desktop. The existence of scp, ssh etc dont solve this problem and while I find it interesting to learn how other admins are essentially making their own central console out of these components, it is a bit much seeing commenters insist that this is the same thing, or suggesting that anyone who wants a central console for their remote systems must be somehow incompetent. Sysadmins can have different workflow and tooling preferences.
update to say that tabby is nice for ssh including key auth, and with profiles and groups it gets most of the job done. There is an sftp “plugin” but all it does is summon sftp. Will see if I can get it to open filezilla and use the env vars in calling the command. Setting aside RDP for now as guac looks like a good fit there.