Bava Batra 59 - August 23, 19 Av

Why can a resident of a courtyard insist on a gutter pipe being moved, but not a gutter itself? If a resident has an item that juts out into a neighbor's airspace or a window that faces the neighbor's property,  can the resident create a chazaka if the neighbor has not complained? Creating a chazaka depends on whether or not it is something we would expect the neighbor to complain about. If they will unlikely complain, their lack of complaint doesn't enable the other to create a chazaka. What types of things does a neighbor not even have the right to complain about?