If only Apple wouldn't unnecessarily break their runtime environment every few releases. What runtime-breaking changes are you thinking of? Apple's been very g

If only Apple wouldn't unnecessarily break their runtime environment every few releases. What runtime-breaking changes are you thinking of? Apple's been very good about not breaking the binary compatibility -- of the runtime, or of their frameworks between OS releases. Sure, there are some differences in 64-bit systems from 32-bit systems. But, if you take a 32-bit Mac app from five years ago, and run it, it will still run just as well today as it did when it was first compiled.