Scenario: I want to position three separate windows so that I can see and use all of them on a single screen. When I launch the three application windows, they launch stacked on top of one another.

With window snapping, I can use keyboard shortcuts to quickly position each window and have all 3 windows be fully visible in their own distinct space, without having to remove my hands from the keyboard.

If window snapping 'doesn't provide any benefit', then there must be some alternate method that achieves what I've described above. What is this alternate method?

You can realistically only look at one thing at one time. Having 2 windows side by side is useful when referencing one and writing in the other. Otherwise command tab to switch works way better.