This update is logical and maybe long overdue. It's the fact that it's been so delayed that made players lazy and content with overly simple tactics like 7 long range + 1 short range.
First off, a smart AI is the best preparation we can have for Guild Wars (unless they give us a smart new feature where we can go player-vs-player training battles where no one loses any troops). But that won't happen I guess, so a smart AI is the next best thing.
On another hand, battle is getting too boring. I mean, we're all happy to finish up sweeping the neighborhood within an hour and packing our 200K battle points with only 2 or 3 units lost max. But IT IS getting boring! A smart AI will only make things more interesting. And there's no need to freak out about losing edge, this update impacts all players the same. We ALL will face the same difficulty at PvP which will make us rethink troops and strategies.
However, where I join big moees, is that the battle is no longer realistic. In real life, long range units are protected by a "wall" of moving units who block enemy charging to get to the long range. The enemy has to "breech" through the first lines before they can try to reach and neutralize the long range in the back lines. Of course, unless they have long range themselves. So that long range aim at long range is totally normal. But that a regular infantry bypasses your first lines and only focus on your long range is not realistic.