I've noticed people saying this but i don't think they realize a lot of that is spread out over multiple things not just the behavior setting. Certain skills can be toggled from enable to disable to prefered, and those options greatly effect whether a character will use that skill or not, and some skills require the character to be within a certain range. example while you as a archer might drop caltrops if you see an opponent approaching you, the AI sees it as you want him to use caltrops so it has to get close to a enemy to do that.. so if you dont want your archer using caltrops up close turn it off that skill. That's how the new tactics work.