There is no reasonable err... reason why there shouldn't be automatic promotion for the top two, or maybe three, teams from the National League. There is perhaps the concern that some minor club with attendences of only a couple of thousand dog-walkers achieves promo while clubs with much higher attendences are left stuck in the wilderness. But fair play to the smaller club, they have earned their chance.
It's perfectly possible that at season's end in any year there are another pair like us and Wrexham running away from the rest of the pack yet one is left behind, sulking, after one loss in the play offs. A top club could win thirty games in the league but lose one in a play-off game because of a dodgy penalty given by one of the multitude of dodgy non-league refs abounding thereabouts, and they are condemned to another year in the doldrums. The play-offs are a farce.