The author makes an excellent point about the integration barriers raised by running a business on an aggregation of cloud services. Sure, they all provide REST

The author makes an excellent point about the integration barriers raised by running a business on an aggregation of cloud services. Sure, they all provide REST APIs. But as your suite of services evolve you must constantly re-implement your client code. And you'll never get the performance you can get from on premises where you may be able to connect directly to a vendors SQL DB because you're hosting it yourself, or eavesdrop on a pub sub message bus.