Big Business' Aesthetics are secondary to its continuity. For continuity, it uses shared elements across systems. Each system displays differently defaulting to its own font, color palette, or common object such as a window or dropdown list diplayed uniquely.
The result is an aesthetic that could be termed, Industrial. Things are generally aligned for strength and scale while sacrificing pixel-perfection. This supports its modularity, translatability, contextualization, and various other long words for built for a purpose.