Here is an example of why Blossom Bar should be scouted. These accidents happen. You need to know what is in your proposed track.
In this case it is simply a momentarily abandoned drift boat. However, it might have been a three boat rescue effort that was in this spot. The last thing you want to do is come around under the horn and then realize that perhaps you shouldn't be there. It's virtually impossible to back-up at that point. There are ways around an obstacle like this if you are skilled and know your way around.
If you are a novice, however, you could easily become an additional part of the problem.
So the bottom line: Don't go where you don't know. Scout first. Make informed decisions.