Question About The Syntesizer

[Miriam2040]

https://www.confident-ai.com/blog/the-definitive-guide-to-synthetic-data-generation-using-llms
Why it separates the query generation from the label (answer) generation?

My initial guess would bee that generating the question with the answer will be more coherent than building questions and then completely separately sending the question to generate an answer. I would say that even from the cost perspective it makes less sense. (doubling the calls and the amount of tokens ) . So I assume they there is good reason about it?