This kind of supports what Graham is saying though. Nobody would get hit in the hands particularly hard if you trained at a speed and intensity level you could handle. People get hurt when they get sloppy, and that should tell you to slow down and work on precision.
But I think you and Graham are missing a critical point here. Swords have tsuba in "real life" and some techniques utilize the tsuba as part of the waza. Saying it is lazy or going too fast or sloppy *totally* misses the point and is frankly ignorant of the variety of things done in various sword arts and styles.