On this front. SD1.4/1.5 is extremely successful, but there has been no followup. SD2.0 was a total disaster that shocked the community, SD2.1 is still no better than SD1.5. StableLM currently is still a joke in performance. Like, they don't seem to even test their models before releasing them.
Compare their releases, to the polished and immediately dominant releases from OpenAI, and you have to question their researching chops. Did they only succeed with SD1.4 because of collaboration with other companies?