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. ...
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"?
I think a good broad description (if not definition) of a "narrative mechanic" is a mechanic in which someone at the table gets to choose how to more directly influence the narrative when they wouldn't otherwise do so.
I don't really think typical critical successes and failures in D&D are particularly good examples of narrative mechanics. For one thing they typically put that narrative control on the GM, who would typically be the one narrating the result of a d20 roll anyway. For another, for much of D&D's history, folks have been ensconcing the results of critical success and failures to tables or simple rules, such that the GM isn't actually choosing the result.