One thing that Cosmere does with the Plot Due is all low the player to choose if Adv/Disadv will apply to the D20, a damage die, or the plot die...and that allows for stacking a/d, too. And situations where a player will choose a Complication on the Plot Die to allow a success on a d20 test that would otherwise fail...turning the Complication into a partial triumph.
I don't think the player can take the lower result on a roll with advantage.
As I stated upthread, I prefer the opportunity-complication axis to be independent of the fail-success axis. It is more interesting that way, IMO.
Not per standard, but that is a pretty minor house rule if desired...and introducing a second axis could make it advantageous.
But why would you want that?
It’s simpler to explain dis/advantage as pick lowest/pick highest because there aren’t any situation where picking the lowest voluntarily would be optimal in RaW, but I don’t think it’s against the spirit of Adv. to pick any of the two results instead of being forced to pick the highest
I do this too. I'll narrate really bad "fail with fear" rolls when they roll very low or really good "succeed with hope". You could use close calls as fail with hope or succeed with fear. I don't think you have to systemize it too much. Five above or five under would do it.
Again, this tightly integrates the two axis so that there is only one axis. And that is fine, but not what DH does. it is inherently more limited and limiting than the two axis resolution.
That is the key element introduced by giving the Complication a bonus to the main D20 test: a player may want to get a Complication to accomplish their main goal if they did not roll high enough on the D20. Hence in Cosmere, the difference between Advantage and Disadvantage is if the DM or player gets to choose which of the two rolls to keep.
