The idea is to allow a player to pick all their advantages first then roll for the disadvantages. By doing this you can make sure that none of the desired advantages will be selected as a disadvantage. I hope that makes sense!
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Defeats the inherent risk in the system. It'd be too easy to make sure the disadvantages you land are just things that will never matter for your character. Introducing a change like this would also require everyone be given a free mulligan to offset the fact that they weren't picking with this safety in place.