For general searches, I agree. I want those to be highly deterministic. But in that case I need to know exactly what I'm looking for.
There's also the other kind of thing though. "Who was that guy that I emailed with a year or two ago about this issue with MacBook Enrolment?". Yes I can filter by company or other details if I remember those things but sometimes I don't. And that's when AI search can really shine. Or not, it can also totally make up stuff out of its ass. But at least when it comes to emails that's easily verifiable.
For the local OS and sustained workloads like video playback, yes, battery optimization is huge. For an individual app with bursty compute, less so, plus some of that inefficient code can run in the cloud instead, which is costly, but premium subscriptions can pay for it, and power plants are now colocated with data centers so power transmission cost is negligible. The incentive to be efficient is insufficient.
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