There have been some interesting responses
And an aggressive and quite rude response
Get a life? Get some manners!
Perhaps the people who think that getting a shot of the summit without other folk in the picture is not important are the people who sit on the summits themselves without a thought or care that other people might like to have a bit of summit time? Just because you think it isn't important please think about the people who do think it is important.
When we have asked people to move so we can take a pic we have got an aggressive and unpleasant response so we don't bother anymore. We now have a laugh with the people who hog the summit (or bridge or waterfall) and take our pictures pointing the camera directly at them and it gives us a lot of satisfaction when they start to look uncomfortable. Afterwards we still can't believe that they don't think to move for a few seconds so we can get a photo without them in the frame. It isn't rocket science