bootstrap is a common design system base for companies that can't afford nor needs a full design team. it's a one-size-fits-none approach, but it's close enough that devs can wrangle it into shape well enough.

larger entities with multiple, decoupled teams often move toward developing their own living design systems as bootstrap no longer fits the many idiosyncracies of the organization.

i'm really looking forward to design systems that no longer rely on set breakpoints/grids and move to fully flexible, responsive layouts and components (come on, container queries!).