Guy: I've only had one arrow break on the bow in 50 years of shooting, and I think I cracked that arrow on a glancing shot previously. Received a pretty good rap on my bicep, which turned black and blue, then yellow. Long story short, very few wood arrows break regardless of grain orientation, because we know a lot of folks don't pay any attention to grain orientation.
Another reason I put the pointers toward the target is that the straightest grain, which is less susceptible to bending/warping, is then on the nock end of the shaft. So, that end of the shaft is straightest to begin with and stays the straightest. It's no fun trying to straighten a bend in the fletched area of the shaft.
Of course, because the grain is also straightest there, it should also be strongest and less likely to break there. Maybe overkill, but doesn't take much work to orient the shaft appropriately, and it provides an extra margin of safety.
Oops. We're getting close to that 200 word explanation.