Some might argue that a "pure" open-source would require the dataset and the training "recipe" as it would be needed to reproduce the training, but it would be so expensive that most people wouldn't be able to do much with it.
IMO, a release with open weights without the "source" is much better than the opposite, a release with open source and no trained weights.
And it's not like there was no progress on the open dataset front: - Together just released RedPajama V2, with enough tokens to train a very sizeable base model. - Tsinghua released UltraFeedback which allowed more people to align models using RLHF methods (like the Zephyr models from Hugging Face) - and many many others
[1] https://mistral.ai/news/announcing-mistral-7b/ [2] https://github.com/togethercomputer/RedPajama-Data