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@hippy
There's a limit to how tight you can get axle nuts. Also, over time they will creep not matter how tight you get them.
Put strong rider on bike and it's nice for them to know that if/when the axle does move forward, it will move only a minimal distance as it has been stopped by the tug.
So, it's less likely to throw the chain or lock the wheel to the chainstay (both potentially crashing you into hospital) when running a chain tug.