How is this misguided?

> If the application tries to write to the memory in future, Windows will give it a private copy

It is textbook Copy-on-write. To me it seems no judgement is made about the programmer.

>If the memory is available, you'd do better to use it, no?

I don't understand... if I have 2 GB of RAM, I should always use all of it? The case being made in the article is to minimize memory consumption to increase battery life - something that will be crucial on tablets I assume.