If iOS and macOS 26 were about AI everywhere, making them the “fuck around” release, 27 can be the “find out” release. Freeze new features and focus all effort on making the system as RAM and space-efficient. Cut the fat, and replace the convenient, memory-heavy data structures we use today with old-school lightweight alternatives (i.e., never use a string when a word-sized numeric value will do — and on a 64-bit machine, it’ll do a lot of the time, coalesce multiple booleans/enums into bitfields, replace top-heavy formats like XML where there isn’t a good reason for them, and so on).