If you have one window, with checkboxes, the window would need to start with the boxes all unchecked. And users, being users, would then demand a way to check a

If you have one window, with checkboxes, the window would need to start with the boxes all unchecked. And users, being users, would then demand a way to check all of the boxes. And then what would the point of the notifications and requests be? If they didn't, people would complain that they had to click all these checkboxes, and then missed one. Or the window wouldn't have room for applications to explain why they needed that access. Or they would, and users would maybe read the first one, but skip others. There is no "better experience" which doesn't sacrifice the point of the prompts.