I think the author actually nails the primary reason in an aside: "As though that were not bad enough, in some organizations there's a separate compounding pro

I think the author actually nails the primary reason in an aside: "As though that were not bad enough, in some organizations there's a separate compounding problem: limited resources. For an organization, attention resources are {time, money, staffing}. In that case you get to layer on the negotiation for resources among competing teams within an organization." While I think the other points are valid, this process of resource allocation alone probably explains most of the problem. As an organization grows, its resources grow proportionally, but the communication required to allocate those resources grows non-linearly. The overhead needed to get $50K from each of two people is more than twice that needed to get $100K from one person. Add in the other issues raised, and this core problem is exacerbated even further.