I was talking about internal big company directives. The ones I've seen failed (Shell Oil), unless they were about infrastructure. (Amazon, Wells Fargo)

Android and iOS are a different case. The diversity they both want, they are getting. The diversity iOS doesn't want is controlled. In a big company, the ecosystems have mostly been internal, and standardizing interoperation has traditionally been about internal efficiencies. App ecosystems aren't necessarily like that -- they are for external consumption. (Though one could make the argument that Intents are about efficiency within the Android ecosystem.)