@macuser_22: but I do not know why Windows would be different.
The Microsoft and Apple systems are very very different. "Why" is because Microsoft did what it did and Apple did what it did (with some support, I admit, from Microsoft).
It's only an illusion, and as you effectively point out a poor one, that "paste" in Windows NT (the part of Microsoft's system that implements this) is the same as "paste" in Apple's BSD based "shell" (the part of MacOS that implements this).
Of course your point does make everything Intuit have said totally ridiculous, unless they are saying that they don't care about their "security" on Mac OS, or maybe that Apple have paid them more to make a working program...
