I doubt I would miss the arm loop in practical matches. If I was buying another sling just for practical matches then I would look at one without the arm loop.
That said, I don't see many people using a sling effectively in practical matches anyway. It is a bit like supported positional shooting - basically no one practices it... and so far we haven't set a sufficiently difficult match with targets small enough to really show that effective use of barricades and two point slings is of a measureable advantage.
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