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A comment on Apple's list of 235 apps that are incompatible with macOS Catalina. Parent comment

Re:Apple's list of 235 apps that are incompatible with macOS... by my123 on Saturday October 12, 2019 @04:48PM (#21236136)
My guess: the old fragile Objective-C runtime ABI.

They could have done a new ABI, but that'd have broken compatibility anyway...

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Re:Apple's list of 235 apps that are incompatible with macOS... by Aloha on Saturday October 12, 2019 @06:29PM (#21236825)
Why is it more fragile than the same objc runtime in 64 bit?
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Re:Apple's list of 235 apps that are incompatible with macOS... by eschaton on Sunday October 13, 2019 @01:12AM (#21238502)
Because the 32-bit runtime has a fragile base class problem that can’t be fixed—without breaking binary compatibility. Class instance variable layout and instance sizes in the i386 runtime are fixed; making this flexible was the major improvement introduced with the x86_64 runtime.
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