I am not sure about having a full graphics environment, but it would be
nice to have the functionality of the server installers rescue mode,
where the system try to create a system tree at /mnt/sysimage IIRC and
allows you to run `chroot /mnt/sysimage` to enter it.
Ditto from me. I wonder though, if the rescue environment could/should try to source a few different options? If, for example, the environment were stored as a tar or cpio archive of extra packages and functionality, then maybe it could look for a full-rescue-env.tar somewhere on the rootfs. But failing finding that, it could fall back to a smaller and simpler textmode-rescue-env.tar stored on the ESP and the final fallback would be the current dracut rescue shell. Then the user would have the option not to install one or the other of the rescue environments if they so chose.
Of topic but related: I wish there was supported option to remove the
current rescue kernel,
Is echo "dracut_rescue_image=no" > /etc/dracut.conf.d/rescue.conf not sufficient?