What's the deal with "private single family residential property" ?

So I have a lot of neighbours, that like to decorate their front yard with all kind of Art (Sunclock, a welded ALIEN figure or a sculpture made out of sandstone), but so much keeps getting rejected as a Wayspot because of "private single family residential property".

I'm mean I would get it, if it is their back yard, which is shut off from public, but everything I see has pedestrian access and can be looked at up close from the public road right infront of the house.

And I have seen plenty of stuff like it been accepted in the last 6 months.

Should I appeal the decisions made or is it hopeless?