We have Several HStyle:

• HBorderAndTitleStyle
• HBoxNodeStyle
• HDefaultStyle
• HDefaultStyleWithTags
• MiHDistributionMapStyle
• MiHSystemComplexityStyle
• MiArchitecturalMapStyle

It is not clear to me why ArchitecturalMap needs its own MapStyle.
How is it different from ButterflyBrowser for example ?