Offering users the ability to switch between different tile layers can greatly enhance the usefulness and accessibility of your map. A layer control in Leaflet lets users choose which map background they prefer, such as a standard street map or a minimalist light map. This is especially valuable when your audience has diverse needs or when your map overlays (like markers or routes) might be easier to view with certain backgrounds.

You should consider adding multiple tile layers when:

• Your data or overlays might clash with a single map style;
• Users may benefit from different visual perspectives, such as satellite imagery versus street maps;
• You want to provide a more flexible and engaging user experience.

However, only offer relevant options—too many choices can overwhelm users. For the best user experience, keep the map interface simple and ensure that switching between layers is smooth and intuitive. Always test your overlays with each base layer to confirm that everything remains clear and accessible.