The discussion of Daggerheart and Hope and Fear got me thinking: D&D sort of has a unofficial "narrative mechanic" in the way that many tables deal with 1 and 20 results on the d20 when rolling for checks. This is especially visible in memes online, of course (Bards seducing liches on a nat 20, etc) but even jokes aside I think a lot of tables give those results extra weight in the emerging narrative. In these two specific, relatively uncommon (but 5% is not that low) outcomes, the die roll is no longer binary pass/fail. Many GMs and players want those results to have a more powerful impact on the fiction of the game.
And yet, many, many D&D players are uncomfortable with "narrative mechanics." It seems strange when I think of it that way.
What do you think? Are 1s and 20s unofficial "narrative mechanics" in D&D (especially 5e)? Do you give those results extra weight (beyond critical hits in combat)? How does it square with how you perceive games with explicit "narrative mechanics"?