the world changes faster than perceptions change. say you invest heavily in getting 1 group represented more because the perception is they are under represented, at some point they will be represented enough but that perception takes time to settle in, at which point you might find them already over represented.

things are never in balance, but always being balanced. there is no point in which all will be equal, but potentially the sway of the pendulum can get less extreme, so there is 'better balance'.

(very generally put)