It is not so much a matter of doing better, more an attempt to return the game to its purity. It is my firm view that Formations and altered detachments are the primary reason 7th has begun to fail, and they are such an obvious ploy to get players to just buy more models and damn the game consequences that, well, I digress. I have a little experience with game design, though I don't flatter myself enough to really say I'm a game designer anymore, but I've always believed that you should not wholesale remake an already successful game simply in the name of change. This is what D&D did with 4th edition, because they believed they knew better than their own fans, and it blew up in their face. Amazingly, GW is about to make the exact same series of mistakes (in my view) even when they have a prime example of what not to do in their own industry (pretty much) staring them in the face.
Perhaps you are right though. Maybe it is a wasted effort. But the reason I wonder is precisely the 3.5-4th edition D&D example above. 40K, like D&D, is not like any of its peers in its gaming market. It's huge, special and possibly bigger than can be really quantified in the realms of wargaming. It is. Just my gut feeling. And I wonder, if like D&D, the company steers it too far away from what it actually is, will the fans just refuse to go along. Not go away, to other things, but just carry on despite what the company wants. Maybe, maybe not. There is admittedly not much precedence. But I look at the big tournaments, how many of them have already done so much to tweak and clarify 40k issues that GW refuses to be bothered with any more, and I wonder what they will do. Will they just go away? Move to other games? They won't be able to run tournaments of an AoS type 40k, and honestly, I don't believe any other game out there currently can sustain them even near the levels they are now. But perhaps, like the fans of D&D 3.5, they can just carry on with 7th.
Anyway, that's the whole path my mind was beginning to steer down when I originally posted.
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For what it's worth, the Kill Team rules seem to work really well for 7th. Looking them over a playing a bunch of games with my brother with them, they seemed pretty Broken-proof. At least, we couldn't see any way to just steamroll everyone. My only complaint is that I wish there were more scenarios, particularly ones using the Tactical Objectives. Still, I'm working on that...