FWIW, and to lay out some of my own cards, I'm not unsympathetic to the idea that GW doesn't produce the clearest, simplest rules on the block. I'm sure they don't. I also think it's absolutely the case that Fantasy and 40k substantially do things the way they do because that's the way they've always done them (igo-ugo etc.); not because it's the best way. But that's the thing: so much of GW's games' identity is the fact that the product has always been in some sense The Same throughout their editions; the Str, T, W, I, A, Ld characteristics are a recognisable part of the game's marketing. You can recognise a GW game from these things and so they don't change that stuff.
I think we all recognise that a big part of why GW does things is for business, rather than game development reasons. Whatever we think of those reasons.
With all that said: because I'm not into the hardcore gaming side of the hobby - I'm into background and painting, dreaming up scenarios and playing casually - I'm not as fussed as you guys about the rules. Most (not all!) of the people I play with aren't either. I do like what I'm seeing of 7th; I think the psychic phase looks interesting and I think they've done some work on some of the more annoying aspects of 6th. I think there's definitely some valid criticisms, and I'm not at all a fan of a two-year turnaround and hope that isn't a new precedent.