Setting style declarations and then overwriting them at higher breakpoints can lead to undesirable ramifications: More complexity. The farther up the breakpoint hierarchy you go, the more unnecessary code you inherit from lower breakpoints. Higher CSS specificity mlsdev.com/services/it-staff-augmentation. Styles that have been reverted to their browser default value in a class name declaration now have a higher specificity. This can be a headache on large projects when you want to keep the CSS selectors as simple as possible.