How do 6 legs give a bee more stability and functionality than just 4 would give?

At any time moving around the hive at any angle, including completely upside down, the bee has a minimum of 3 legs in contact with a surface at any time giving maximum stability in any position a bee takes while completing her tasks. Any pair of legs can be used for specialized tasks while the bee’s body is secured by the tarsal hooks of at least 3 legs still in contact with the surface or hanging onto other bees’ bodies, as when grouping to make wax comb, sometimes called “festooning.”