FWIW my understanding was that it was already once-per-year 99% of the time, with the off-cycle bonus being intended for weird circumstances (starting at an unusual time that left a big gap in between bonuses, retention for employees likely to leave). Someone correct me if I'm wrong though!
EDIT: Clicking through to the Bloomberg article actually provides the context I was lacking:
> The majority of Apple’s divisions had already moved to a once-a-year schedule for bonuses and promotions, including software engineering and services, but staff in operations, corporate retail and other groups had still been on the outgoing biannual plan.
I wasn't aware that non-engineers were on a different schedule, but I wouldn't regard this change as "cost cutting", just consolidating some differences across orgs.
https://www.bloomberg.com/news/articles/2023-03-14/apple-del...