So my TLDR, is that its possible to be a USER without touching the terminal, but I dont think its possible to be an administrator without.
Suse with Yast makes it possible to administer just with GUI. Not 100% sure if it can do absolutely everything possible but it has lots of tools.
This command won’t show the real values when using btrfs. You need to use
sudo btrfs filesystem usage <mount point>
.