@Anton yes! macros are like that too, it still confuses me sometimes.
Control of the styles tab would be great too. Or at least better documentation. I've gotten hidden={ "default":false, "mobile":true } to work on sections, etc. before.
A dnd_section creates a layout "row" within a dnd_area. It only accepts layout-related parameters (like offset, width) and content defaults, not labels.
dnd_section is meant for structural layout, not for naming UI elements in the editor.
Hard to say why it's not posiblle because it could be very usefull. But as you stateted, the documentation tells us it's not posible and it wont do anything effectivly in the UI (sometimes it's not yet documented, so UI always try those things out.) I guess you have to put it on the Idea board !