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But,
Would like to see…

You new semi-graphical way of using a button to move a proposed new partition to the beginning or end of free space… I hope that the operation is done without detail, I doubt that the average user will care about cylinders or sectors.

Also,
I find your description of the UEFI vs MBR when a bootloader already exists interesting, but is it sufficient or complete? It’s my understanding that the problem is really “MBR vs GPT” and that GPT supports a mixed mode of both UEFI and MBR although most people think that if you have a UEFI boot (typically because they’re multi-booting Windows) that they also need to install openSUSE using UEFI… which shouldn’t be true.

Bottom line I guess is that the Installer should guide the User to configure what is supported for a problem-free experience, but somewhere it should be noted if the Installer is lacking in some kind of capability that is not consistent with published RFC. And, if a certain selection will likely lead to a bad result, I would expect that something stronger than a “very” strong warning is displayed.