Homogeneity in developers is useful in the same way that homogeneity in servers is; it reduces the dimensionality of the problem. Instead of having 1 unit of 20

Homogeneity in developers is useful in the same way that homogeneity in servers is; it reduces the dimensionality of the problem. Instead of having 1 unit of 20 different resources to allocate, you have 20 units of 1 resource. That said, sometimes (read: 10-100x developers) you sometimes have only 1 unit of 1 resource. And if you don't pay for it, you wind up with 0 units.