I could not find any similar idea in the Wishlist, so posting it. I am pretty sure that you guys must have thought of having multilevel (multi-floor) map support in your future. My idea is to make that seemless, without needing user to switch manually.
Rather than expecting user to select the map once the robo-vac is placed on a different floor, you can have multiple charging units per floor. Robo-vac can commnicate to the charging unit to determine which floor map to activate. All the user needs to do is pick the vac and drop it on the charging unit on a different floor and rest the smart vac will do itself.
Mod edit Added terms multi-level, multi-floor and multiple floor support to help with searchability