yeah I don't agree that the actors should stop and pose with a person if they ask for a pic.
BUT Uni and sometimes the actors take it too far the other way too, which is my problem. I remember in 2011 if the actors saw a camera they would stop scaring to cover their face. that was just as bad as posing with people. I remember in the Canyon scarezone that year a really angry security guy yelling at people for even taking their cameras off. I got yelled at for texting someone because he thought I was taking pics with my phone. it was not a nice moment.
So, Like you said, talking pics of the zone making you more creative, I agree. Posing is annoying, I agree too.
But since it seems with Universal it is either All or Nothing, I prefer photo ops with actors posing (even if it is annoying) than actors covering their faces or walking the other way to avoid your camera.