without disparities in situation, motivation, and capability, a society slowly loses its ability to react to new situations and break out of local maxima; there's a point past which this spells death, in the inevitable situation when an existential challenge is encountered
that's just on the macro level; on the micro, what do you imagine this does to an individual's drive to make something of themselves? to meaningfully affect the world? the hero's journey requires there be to be a frontier for which to reach; w/o this possibility, what is left?