If you can only find wonderbread I am surprised.

Example of great bread: https://www.ibfoods.com/search.php?search_query=Bread

None of the breads listed there I would consider to be of the category "bread" as a German, and what I would be looking for when I wanted one.

Yes, a French baguette-type soft white bread is formally "bread", but it is treated as a different/single category here, as "white bread". With examples of typical bread being, say: https://www.hofpfisterei.de/download/Hofpfisterei-Sortiment-... And I don't think the images really carry across the difference (and variety) in texture and density, to someone who simply never had this kind of "non-soft" bread. You can spread cold butter from the fridge on it without breaking it, maybe that gives away a hint towards the difference. Also note the variety of grain: rye, spelt, wheat, barley, oats, in different compositions and degrees of fineness. And this is just one brand/bakery.

Some more "typical German bread" images. I picked types that maybe convey the difference to "white bread" the best in viewing:

https://5-elemente.org/wp-content/uploads/2024/03/rheinische...

https://heicks-teutenberg.de/wp-content/uploads/2014/07/Honi...

https://img.chefkoch-cdn.de/rezepte/2468131388854443/bilder/...

You've proven their point for them.