D&D is on a path of revisions every 8-9 years, with 3.5 being a blunder which gets pasted over in WOTC marketing materials and will likely be admitted to one day with more time and perspective. Omitting 3.5 would put D&D back on the 8-9 year release cycle, and would have inspired a lot more good will towards 4th.
40K revisions are a bit quicker at 5-6 years. In the White Dwarf article, I found it interesting that customers were disappointed with previous edition codexes because of their small page count. Future editions, we're promised, will be beefier. It sounds like a D&D supplement strategy to me. Bigger books, preferably hardcover, with an obviously higher sticker price.
Both games have accelerated their pace in the last decade. Both are among the handful of game companies that are publicly traded corporations, WOTC being owned by Hasbro. Both companies are under the gun to increase profits in the short term. When you run a corporation, the primary goal, which you can be fired for for not completing or even criminally prosecuted for not executing properly, is maximizing shareholder value. Everything you do is aimed at that bottom line, more so than other businesses.
Is that bad if you're a customer? It might feel like a betrayal if you're under the misguided impression that these companies exist to enhance your fantasy life, rather than maximizing shareholder value. The main thing to remember about hobby games, is that they can only exist if customers are actively engaged in the hobby; buying, building, playing. I can tell you that D&D sales flagged over the last two years, as the writers mined the depth so what was possible with the game. 40K sales are dependent almost entirely on new releases, which are always just a tad better than previous releases (or else they tend to do poorly). Like any product you consume, decide your level of engagement and proceed.
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