Well they just glossed over the asynchronous processes that had to be kicked off, the analytics that had to be recorded, the instrumentation that was plumbed in

Well they just glossed over the asynchronous processes that had to be kicked off, the analytics that had to be recorded, the instrumentation that was plumbed in, the validity and safety of the request prior to doing anything, the caching layers that need updating, the websocket client updates, and the design of the object model in the first place. But we knew that's what the author meant. /s