Ah yes, I long for the halcyon days of IT stability… oh wait, business has always been fraught with risk and trade-offs. You get insurance, put mitigations in place, and hope when it does go bad, you can blame Microsoft anyway.
I understand your point, but the probability math works against you as the number of platforms grows, unless you have excellent data segregation and access controls. What happens in most cases, each new platform serves as an attack vector to be exploited to gain access to all of the data.
Mono culture is always a bad idea and thinks like MS cloud services are the basis for creating a technical pandemic.