I'm posting this from my iPhone, so I can't be bothered to name names, but trust me when I tell you, there are a lot of people criticising Apple for basing the iPad off the iPhone OS, rather than making it capable of running Macintosh applications by using a touch-enabled version of the version of OS X that runs on Mac desktops and laptops. I understand the impulse, but these people are either crazy, or they just aren't thinking things through.
Let's get one thing out of the way right up front. There is just no damn way to profitably sell a device that matches the price, performance and portability of the iPad that also runs existing Mac apps. This will change in the future, but it's just not something that can happen this year.
There are many reasons for this, but it really starts with the fact that modern Macs use Intel CPUs and Intel CPUs just aren't as power efficient for a given level of performance as the ARM CPU in the iPad, iPhone and other mobile devices. So, an iPad that runs existing Mac apps would have to have an Intel CPU, and so would have shorter battery-life, which hurts portability.This could be compensated for with a larger battery, but a larger battery would be heavier, which hurts portability and add expense which would already be higher, because intel CPUs cost more than ARM CPUs.
So on the hardware side, price and weight are two strikes against an iPad that runs Mac apps, but that is only half the problem. The bigger problem is software.Mac apps are built to be run on fairly powerful computers that are capable of multitasking and which people use a mouse and keyboard to interact with. There are a few implications of this.
First, there is a good chance that existing OS X apps, designed to run on powerful hardware, would be both slow and power hungry on an iPad becuase acceptable performance and efficiency on a iMac or MacBook could be completely unacceptable on an iPad. This is on top of the inherent power-efficiency disadvantages of compatible hardware.
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