Because sometimes the flight isn't all that full or it's a smaller plane. I remember once on a CLE - LGA on Continental, the gate agent called for elites to board and I was the only one. Soon after they boarded all rows, which turned out wasn't a full flight. If it's a full plane, say like a 777 and the gate agents tells everyone to board, then that's asking for trouble. But that's an unlikely scenario anyway.
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