Wait a second; any strike toward any direction is a hard block on the way; so, how is it you don't understand the use of a hard block.There are some of us who would maintain that there are no 'blocks' in karate and that even the parries can be aimed at particular targets.
You have mentioned Wong Chun as if it is 'soft'. When we look at the origin of karate it too has its roots back in China. Why would things have changed so radically? Hard blocks make no sense to me at all. :asian:
Sean