When reading about strategy, I often hear how important obstacle placement is. For some things like Rebel Han, it makes sense to scatter them so there is more area for him to be within range 1. There are other pilot and upgrade specific instances like Trick Shot, and others I can't think of off hand. But I can't seem to get my head around why *generally* it is so important.
I hardly ever get to play against people, so my experience and skill is very low. I'm trying to learn, though, so please give me some thoughts, reasons, and examples as to why I need to think about where the rocks are.