The point of Blackreach is that its not faction-locked, thus supposedly allowing players to swap to the outnumbered team in search of good fights when the map is taken over by the dominant faction. Theoretically, this should be a prime time to see that happen.

Now, what we see more often is that non-faction-locked play also allows for players to swap en masse to the winning side, which may account for some of AD's apparent dominance. Since their players don't actually want good, outnumbered fights, they stick with their only chance of making AP: zerging with AD to crush whoever touches their stuff.

If they really wanted to maximize their AP and were willing to do so as a group, they'd do the other thing that non-faction-locked campaigns allow: log onto another faction en masse and go sweep the map for easy AP. That's not exactly good for the health of the campaign either, though, so maybe we can be glad they don't?


Now, to be fair, faction-locked play has its problems! And faction-locked campaigns can run into exactly the same problem of groups taking the whole map and zerging any offense when there's a big enough population disparity in favor of one faction. But then again, one of the criticisms of the faction-locked campaigns was that "well, then players can't swap factions to have outnumbered fights and rebalance the campaign"...so I find it a little darkly amusing that, apparently, players in the non-locked campaigns don't do that either even though they have the choice.