I've been enjoying some games of Necromunda lately. Necromunda is undeniably and unavoidably a narrative-focused game. Does this mean I'm playing it casually? No, it means that I'm playing Necromunda. And the fluffier that campaign gets- and Necromunda starts fluffy and gets fluffier- the more effort we put into it. Because the logical progression, as the rulebooks suggest, is having a GM running the campaign, devising scenarios, arbitrating third party units in the game, and so on. Certainly more work for someone. And as for the players, they often have to literally play at 110%, because 10% of your gang got sick harvesting fungi or whatever.
And I still think that's the best way to play 40k, too. You're free to disagree, and there's no problem with that, because you're probably playing a different game than I am. And maybe sometime I'll be at a games store and play against a player like yourself, and it would be half this, half that, and there would be no problem with that, either.