Personally I hate reheats and over time they build up quickly. Using a tail mold cuts down on reheats. With the tail mold I have I can shoot 24 tails with just a sprue leftover. To shoot 24 tails with the 12 count body/tail mold I have I would have 24 bodies and 2 sprues leftover as reheats. This adds up. Back in the day when I poured a lot I’d have several tail molds and would do tail runs meaning I would stock up on several tail colors I use so I could quickly grab tails when needed and shoot a body on. Makes it easier. Another thing it is easier and more uniform to pull a tail off a sprue than to cut off a body.