Good frontend boundaries are not about adding ceremony, they are about protecting clarity. When features, state, and UI concerns bleed into each other, small changes start causing surprising breakages in totally unrelated parts of the app.

Clear boundaries give each part of the system a defined job, which makes the codebase easier to reason about, safer to change, and far more sustainable as the product grows. In that sense, boundaries are not constraints on speed, they are what make speed possible over time.