We are usually on the same page, but I'm gonna have to disagree with this one.
I'm okay with that - and it's nice to hear the first bit.
System matters. The fiction and the ruleset should not be fighting each other.
Well, I agree with this part!
The tone shift that D&D have been experiencing with each iteration reflects on it's mechanics and vice versa.
Sure, but I guarantee you that I can still run my gritty weird western under the current rules. Probably better than before, in fact!
Again, I'm not arguing that more rules variants would not be nice to have. I'd love to have 'em. I'm with
@dave2008 in really, badly, wanting a book full of variant rules, and I'm one of the many folks who still lament that 5e never managed to pull off their early "promise" of Modularity.
But I don't think that those variants
need to be in the DMG, for the DMG to be an excellent book. This one is that. Excellent. I agree with everyone that it's a shame that there isn't a version (preferably an improved version) of the "Gritty Rest" mechanic, or something of the sort, but I can follow the rules that ARE presented and achieve much the same thing. Or if I like, just use the 2014 version. Or make up my own.
The way I do Initiative isn't in the books either, and you don't hear me complaining about it. That's all.
EDIT TO ADD: And I'm not saying that anyone is not allowed to complain! (See my earlier comment to Micah) It's just... pick your battles. We tend to get really worked up about what amounts to very small details.