One word

In a world of qualified only pointers, many unsafe languages become safe.

Take for instance, the possible choices:
pushed * : pointer to <insert type> allocated on the stack
pooled * : pointer to <insert type> allocated on the heap
intern * : pointer to <insert type> local method allocation
extern * : pointer to <insert type> nonlocal method allocation

There are others, like method * and shared *, but they are hard to explain to n00bs.

Without generic one-type-fits-all pointers and the disallowance of casting between pointers, it would become impossible to manipulate instances of user defined classes. And, that's not all; many problems could be caught by a compiler that previously could not be.

Ha! Revel in my genius!

>>5
Wrong.

Program HelloWorld {
    HelloWorld() {
        Window shared [] win = System.Windows;

        for (size i = 0; win[i]; i++) {
            if (win[i].hasFocus()) {
                win[i].write("Hello World!");
            }
        }
    }
}

Phail you, win I.