With Breakdance 2.x. came a new way to set up the layout / flexbox. The new layout engine should make it easier for everyone - beginners and experts. However, it's kind of not useful if you cannot set different layout settings per breakpoint.
It's quite common to have a horizontal layout on Desktop, but a vertical layout on Mobile.
Often mobile optimization happens later on in the building process. Now I must manually change all settings from the simple layout engine to the advanced settings. Basically this means, it's better from the very beginning to ditch the simple layout options and go for advanced, because only advanced allows to set up different settings per breakpoint.