SUSE engineers felt that with Agama up to now it was too easy to accidentally install SUSE Linux Enterprise / openSUSE without any desktop environment selected. So one of the key changes with Agama 21 is now warning users if they are attempting an installation without a desktop environment selected, to avoid the shock of booting your new installation with just a text-based system
"That was not obvious enough in previous versions of Agama. As a result, it was too easy to end up installing a system with no graphical interface at all. The resulting text-based system could be daunting for many users, especially newbies to openSUSE or GNU/Linux in general."
So with a proper warning, this won't hopefully be a concern moving forward.
Agama 21 also improves the network management options from its web-based UI, supports installing now to an existing Logical Volume Manager (LVM) setup, and adds support for systemd-boot as an alternative to GRUB2.
More details on the Agama 21 OS installer release via Agama-Project.GitHub.io .