As for Apple foundational models, I think the issue is more that they’re just not very intelligent or good; maybe WWDC will change that; but if you want to implement LLM functionality, you’re better off either calling an API, or shipping a better small on device model.
I find many frustrating. I had an iphone previously and the llm summaries of text messages are what drove me to finally drop ios. I have a family member who is undergoing cancer treatment. I can't explain to you the frustration of seeing wrong text summaries when an llm goes wild hallucinating test results when the actual text simply said taking a test. OS basics and communication should be trustable. Not perhaps hallucinations of a small shitty model.