I don't think it's fair to assume that public code means either they won't also use internal code or that it will necessarily be inferior. It's hugely frustrating that they still haven't released it, of course. It's also frustrating that none of the LLMs are all that good at Swift—SwiftUI in particular—but it's not surprising since nobody else has any real incentive to be good at it... It's Apple's party, so they should get on it!