On the Download page for ISO’s, a minor suggestion, add magnet links like Ubuntu has. It makes download much quicker if you have a fast connection to have 100 or so sources to download from Simultaneously.
Hi and welcome to the Forum 
They are there, just on the pick a mirror page…
https://download.opensuse.org/distribution/leap/15.1/iso/openSUSE-Leap-15.1-DVD-x86_64.iso.magnet
But,
I agree.
This is another of a few things where what you’re looking for exists but instead of making it easily available to someone who has no prior knowledge, it’s hidden somewhere behind a procedure you need to know.
Recommend submitting a “Feature Request” to http://bugzilla.opensuse.org.
TSU