Comment # 8 on bug 1230002 from Stefan Hundhammer

I just downloaded 

 
https://download.opensuse.org/tumbleweed/iso/openSUSE-Tumbleweed-DVD-x86_64-Current.iso

and mounted it. There are 4629 RPMs on that ISO, but indeed neither
systemd-boot nor sdboot-util is among them.

While 4629 sounds like a lot, Tumbleweed as a whole has 15,705 source packages,
of which most have a number of subpackages, so it's 53,773 total:

  zypper packages | grep -c 'Main Repository'

  53773

Which means that even a 'full DVD' ISO (limited to 4.2 GiB) can only hold about
8.6% of all packages.

That means a drastic selection by the TW release / project manager what goes on
the DVD and what does not.

Since one main use case for using such a DVD ISO is to be able to install
machines with only very limited Internet access or no Internet at all, that
means selecting those packages that are most commonly used.

And probably that means that use case does not include an exotic installation
scenario like systemd-boot; only less since you can easily get access to those
two packages by simply allowing to use online repos during the YaST
installation.

So AFAICS this was a conscious decision by the release / project manager, which
means this is not a bug.