Apple is the only company so far that seems to be unwilling to accept a poor user experience with generative AI, so their efforts have been "lackluster" in terms of "AI integration" - as if "maximally integrating generative LLMs" is the goal in and of itself!
Of course Nadella is critical of Apple's efforts: he selling the goods! It's like a Steel CEO complementing a new bridge but then "they should have used more steel" - well duh, but since when do we trust the purveyors of components as to what should be added?
The bottom line is "Agentic AI" is just unreliable. If you thought you hated Apple Intelligence now, then if they had gone whole hog, the unreliability would be astounding.