It always fascinated me the thinking that "a design system makes everything look the same". Well yes, a brand's, in this example, web experience should be consistent and feel familiar no matter where you are in that experience.

And with the extensibility of a system through themes and variables you can add additional palettes to leverage if you need a special case page or experience. Imagine the inverse. A fragmented experience where each page uses a different grid, buttons have vastly different colors.