My post should have come with a trigger warning!
Funnily enough I was thinking of your project and wondering how you got on, since it's open world, huge and you can go back to the areas, that seems to be the big problem. Even now I'm thinking about all the triggers that I have that need to trigger just once and I'll have to convert to flags at some point, it must have been a nightmare for such a big project, I'm glad you got through it!
Some in game labels to flags would be a nice addition to make things easier.
I'll be interested to watch the video and hopefully that and this post can stop a few people who might do the same thing as we did otherwise!