Years ago, I hypothesized (and published with evidence) that a well-known (but poorly understood) chemical reaction was governed by repulsion: Electronic repulsion at its very core. Briefly, a catalyst separately held the same substrate in two different ways; an incoming hydrogen molecule would then chose which of the two configurations to ride over the barrier
A catalyst is rather like a politician. Its job is to bring us lowly substrates together to make something more stable. But just like my chemistry example, the favored politician with the clingier hangers-on can be the kinetic loser. It's the repulsion, stupid.