The factions rule should never have been changed along the lines that Steve54 suggested in my opinion, but for the sake of simplicity, I'll just link to the
original discussion, as my view hasn't changed since we last debated this point.
As for the two options proposed, removing the rule completely, while not unprecedented (see various changes to Chaos down the years in 40K), rather drives a coach and horses through the background, so I'm a bit sceptical about this; while option two could cause problems for LatD lists (although not mine, as it's a Khorne/Tzzentch army).
Just reverting to the original rule prior to the changes announced in the thread I linked to above would be my preference.
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