Underlying this seems to be a hard engineering problem: how to run a SaaS within UI timeframes that can store or ferry enough context to tailor for individual users, with privacy.

While Eddie Cue seems to be Apple's SaaS man, I can't say I'm confident that separating AI development and implementation is a good idea, or that Apple's implementation will not fall outside UI timeframes, given their other availability issues.

Unstated really is how good local models will be as an alternative to SaaS. That's been the gambit, and perhaps the prospective hardware-engineering CEO signals some breakthrough in the pipeline.