Amazing how an entire profession that until yesterday would pride itself on precision, clarity (in thought and in writing), efficiency, and formality, has now descended into complete quackery.
I can understand the benefit from XML if there is a at least a three-level variable structure to share with the LLM. If there is strong consistency in a repeated three or more level structure, then JSON ought to be sufficient. If there is just a one or two level structure, it feels like unnecessary quackery, possibly reflective of a poorly trained model if the structure is a genuine necessity.