There's already a lot of info in there: model architecture and mechanics.
Using the model to generate synthetic data also allows to distil its reasoning power into other models that you train, which is very powerful.
On top of these, Qwen's technical reports follow model releases by some time, they're generally very information rich. For instance, check this report for Qwen Omni, it's really good: https://huggingface.co/papers/2503.20215
How does "open-weighting" help other researchers/companies?