Not really, have you seen an Australian Football match? A player can kick the ball for a 6 point goal between the two large posts, and if it misses and hits the post, he still gets one point, like he would if his kick whet in between the large and small post.
No one who watches a game ever says that that's awarding failure, and it IS football (best game on Earth if you ask me)
If they did it this way, the same theory would still apply for the single, expect now the D would have to work more to stop the O cold before they get in range, and try even harder to block the kick cuz they know that the O will have an even better chance to get the Single if their in range.
At the moment, it makes no sense to give a point for kicking the ball OB and no giving a point when the ball comes close to either going in or going OB, but then hits the post for no score.
and how many times does it happen? not much, so why not?