As a non root user you should use this form of the command:
sudo /usr/sbin/grub2-mkconfig -o "/boot/grub2/grub.cfg"
Thank You,
Oh how I am growing to hate grub2!
os-prober comes back with a result of 3 windows pieces. It shows nothing of lInux. Oh, before you ask, yes it is there and yes it defaults to Opensuse. What a lame jump the gun idea this was. If there are not any decent tools, why on earth foist it upon us users. Dang. I’m a little nervous to revert it back to grub, but don’t see where I have much choice. I’ve wasted way too much time already.
Grub had to be upgraded to deal with UEFI PC’s and hard disks over 2.2 TB in size. While there are glitches, I have not yet been left high and dry with an unbootable system. Perhaps working with the Grub 2 files might change your thoughts. Have a look at my bash script for working with Grub 2.
GNU Grub2 Command Help/Config Editor - Version: 1.94: https://forums.opensuse.org/blogs/jdmcdaniel3/gnu-grub2-command-listing-helper-help-input-106/
You can not complain until you have tried to understand how the new tool works. Only you know if you have really tried. Further, if you have real suggestions for Grub, why not make them in our openFATE, our feature request tracker (https://features.opensuse.org/).
Thank You,