10lb will fish light weights even better... remember, most braid's breaking point is actually much stronger than advertised. The thinner the diameter the less visible the line is.
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edit: re-read this thread after several hours and found I did a p*ss poor job of reading the OP's initial post... 10lb would be too thin for baitcasting, my mind was focused on spinning gear. I've used 15lb with baitcasting gear, but I agree 20lb is a practical bottom diameter.