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> This means that teams must make an up-front architectural decision to develop apps in a server-agnostic manner

Right. But none of the cloud providers encourage that mode of thinking, since they all have complete different frontends, API's, different versions of the same services (load balancers, storage) etc. Even if you standardize on k8s, the implementation can be chalk and cheese between two cloud providers. The lock in is way worse with cloud providers.