> management simply doesn't want to be responsible for it

The problem with this kind of thinking is that it strips away all nuance. At some point you have to be responsible for something ... otherwise you don't have a business. You are simply a wrapper around your SaaS providers and tightly coupled to their success. The key is knowing when to offload and when to keep it in house. Quite frankly, your average weekend MBA VP simply doesn't have the expertise to make these kinds of decisions. This is why so many VPs exit before things get bad.