Really not sure what diverting it does other than move where it pours on the sidewalk so I would just remove it? All homes I have seen including mine drain close to the foundation so it should be ok. Long term you could see if a spouting company could move the drain spout to another location of the roof which they did when I added whole home gutters? Not much else you can do other than run under the sidewalk and drain on the other side using a pop up emitter to hide it.
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I will say the things that others are probably thinking but afraid to say.
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