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Why does the HoughLinesP output a 3D array, instead of a 2D array?

This is the sample output I have -

[[[539 340 897 538]]

 [[533 340 877 538]]

 [[280 460 346 410]]

 [[292 462 353 411]]

 [[540 343 798 492]]]

Its dimensions are (5,1,4)

I am trying to understand what scenario will the function output something like (n,2,4) or (n,3,4). But I can't think of any and all the images I have worked with right now result in a 3D array of dimensions (n,1,4).

Wouldn't just a 2D array be sufficient and perhaps more efficient?