It's the death by 1000s cuts mentality. - the end-user doesn't see it. "why can't you just do this" "it doesn't take long". it's only a "1-hour job" its soo simple just quickly do it.
However, they are the same people who then say... what do you mean 1 hour * 240 workdays = 6 weeks.
What do you mean the other project is now delayed by 6 weeks!!!! can't you just do it all?