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Answering the original question - weight. Being able to throw a very specific weight on demand is more valuable to a team than hitting the broom. Why do I think that? Hitting the broom is very observable - you can see it out of hand and adjust. You can't observe weight from the other end out of hand. So any'early in the shot' adjustments are pretty reliant on the interpretation of the thrower and the sweepers for weight. By then the shot might be gone. Ironically - I'd say most club players spend about 95% of their throwing practice time on 'hitting the target' and about 5% on 'throwing this specific weight'