Well isn't that convenent for Apple and what a money maker for them. Guess I'll stick with MS Word.
God I have been with Apple since 1990 when I bought a used Lisa from My late uncle Lloyd. I have had problems with programs not being able to run the latest upgrades and updates because of the PPC chip and I thought with my bithday preant from my wife of a new Mac Pro I would finally able to put an and end to this problem. No Way!! And my 3 hard drives in the G4 are not compatible with the Mac Pro. The Fire Wire 800 transfer does not work so all my files are lost. Oh Well?
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I don't see the incompatibility as unusual. You can't run an Android based app on a Windows or Linux or Apple computer. Apple II software won't run on any Mac, nor for that matter will Mac OS 9 and earlier software (or OS X software written for the PPC processors) run on a current Mac (or iPad, or windows computer, etc.)
Different processors have different requirements. They also have different strengths, which is why you don't find the same processor in a Mac Pro as in an iPhone, etc. It might be possible to replace the processor and rewire your Mac Pro to accept and run iOS and iOS software, but I don't think you'd be happy with the results.
OTOH, Apple could supply (and charge for) both the iOS and OS X versions of current software in the same package. Then the complaints would come from the people who had an iPad, but not a Mac (or vice versa), and had no use for a second version of the software.