When I was writing apps at Apple for the low-integer-version-numbered iOSes, this is what we typically did (since we had a single-core CPU in the MHz and <1GB).
UI shell in UIKit Obj-C, over a C++ or CoreFoundation (C) business layer, talking directly to sqlite.
I haven't seen the source of Apple apps and frameworks in over 10 years now, but I hope for their sake a lot of it has moved to Swift by now.
If I were CFed I'd mandate 2026 as the Year of Claude Code Radar Burndown. Their backlogs are insane and Apple actually addresses maybe 5% of what it knows to be wrong in a given year. Make it 2% when a UI Refresh is mandated.
Thats one dimension before another long term milestone: Realtime generation of 3D mesh content during gameplay.
Which is the "left brain" approach vs the "right brain" approach of coming at dynamic videogames from the diffusion model direction which the Gemini Genie thing seems to be about.
Yes, this looks like O(1) actions, where before, its likely that harnesses are ingesting and outputting huge portions of the source files for each step, and the local uses of str_replace() are themselves O(N) on the users computer. The excess reads and writes from the LLM are O(N^2).
I don't work there anymore, I wonder if they're using the C++ - Swift interop that now exists.