Oh, I agree. But one of the things you learn by doing that is that strength and (physical) power don't help much if the other person has more of them, and therefore relying on them in a self defense situation is extremely unwise.
Well, yeah, but striking doesn't rely on strength and physical power -- not if you're doing it right. Ref. the point I made earlier: you don't have to be very strong or hit someone very hard, if you hit them in the right place.