I played FRC14 yesterday and we had 3 red engies built up on the high ground above the final point. We were all wiped out by demos that had an angle on our locations without being exposed to the sentry fire. Of course it didn't help that there were spies all over the place, but with 3 stickies being able to take out a sentry the wooden building with the windows makes for a great place for demos to hide and spam sentries that overlook the final point, no uber needed. I remember playing way back when the map was red heavy and the final point hasn't changed all that much but I think you're right about the default route people take to get out of red spawn to the final point. I take the vent and then go up the stairs to the wooden building and then down into the final courtyard above the last point, there's probably a faster way but it's not obvious at all.