There is a long answer and a short answer. The long answer involves a lot of technical detail, much of which I am not up the speed on, and is very difficult to understand.
The short answer is very short. Unfortunately, I can't repeat it here because this is a family environment.
There is also a medium-length answer, which is probably the most useful one of all. It is because Photoshop is a vast, poorly designed monolithic application that gets far too little attention from its owners because there is no point in fixing up its many faults. It's cheaper and easier to simply buy out and shut down any competing product the moment it even remotely threatens to disrupt Photoshop's comfortable and very lucrative monopoly. For a while there, it looked as though Paint Shop Pro was going to threaten the Photoshop monopoly. Luckily (for Adobe) Corel bought the company, saving Adobe a lot of money, because PSP can now safely be left to self-destruct in the hands of the same bugfest experts who destroyed Word Perfect in just a few short years.
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