REM and EM are powerful relative units for breakpoints, allowing your layouts to adapt not just to screen size, but also to user-specific font preferences, making your site inherently more accessible and fluid.
Example: If your base font size is 16px, a breakpoint set at 64rem triggers at 1024px. But if a user sets their browser’s default font size to 20px (for larger text), that same 64rem breakpoint will automatically trigger at 1280px, ensuring your layout remains optimized for their viewing needs.