The point of diagonal orientation is to get space where it's needed the most. An 8 foot slider (for discussion, however most full size are longer), will require 16 foot of real-estate front to back, plus room to stand. Imagine ripping an 8 foot board, or sheet of ply. You'll need 8' behind the blade, and 9' to 12' in front, depending on your girth. When crosscutting the same board, you'll need 9' or so left of the blade.
Visualize the work movement, you'll see that you actually only really use a zone the width of your outrigger table for most of the swing, but for that 2' of commonly used crosscut space, it needs to be the length of your longest stock, plus a little for the end of the fence. The rip space is similar, front to back 12' straight behind the slider, but only 8', another 4' to the left. One more foot to the left, and you very rarely need anything over a few feet deep.
What you end up with is a virtual heat map of where you stand to use a slider, that's actually a triangle shaped space to the left of the blade, that when the saw is turned diagonal in a square space, fits quite well. What it does is enable a more efficient use of space, and face it, even the biggest shop will need more space in places.
My saw is a CF741, which is a 700 saw/shaper, and 700 planer/jointer as a full combo, so I get the same benefit of the diagonal on the right side of the machine too.
Dorky picture, but attached to show for scale what might fit in the space.
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