Server connections/ping can lead to these issues. A Also some people can be forgetful as they haven't done the content for a while and it's a one and done situation. So I wouldn't say it's justified to hate on everyone for that alone.

However people moving Akh Mhorn stack markers FAR away from the group (Looking at you Niddhog/Midgar), or going into the wrong alliance group so they deal with two stack markers (Looking at you Ozma/Hashmal), that's when it's fair to critique it.