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by astrange 5889 days ago
The difference in maintainability is pretty big - iTunes and FCP are some of Apple's oldest application codebases at this point and both probably need a total rewrite to be up to their modern standards and work with 64-bit/background threading/etc. (They also both started out at other companies, though who knows what that means.)

I assume the reason they haven't been rewritten is the same reason that QuickTime 10 isn't finished yet. But I don't know what that reason is.