There is a limit to how much you can go back and rework. I have missions that play quite well that had a squads of loons parachuting from choppers, and each loon had their own trigger!! I am embarassed to think about it now. My previous mission I think is quite good - but even there I was detecting the death of individuals using triggers instead of event handlers. Building a large mission, which as you know I am now doing, really forced me to think about what I was doing, how I was doing it and why, and then when I had an answer to all that, then think: is there a better way?
I know if I so much as look at one of my old missions I will end up re-making it. "And a good thing too" I hear some of you say!