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A comment on macOS Catalina, 64-bit, 32-bit, and related Questions. Parent comment

Re:macOS Catalina, 64-bit, 32-bit, and related Questions by xenadu02 on Saturday June 22, 2019 @08:37PM (#20252553)
32-bit macOS uses the older fragile ObjC runtime. Meaning no macOS frameworks present on 32-bit macOS could adopt newer features. In fact they couldn’t even add new ivars because that changes the class layout and would be ABI-breaking.

That’s beside the increased disk space and memory used having two copies of everything.

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