Having just a dialogue tree negates any skill the character is supposed to have. We can choose the approach (e.g aggressive, compassionate, etc) but skill should determine how effective we are with that approach. And the way to gauge that is with a roll.
The OP point, I need to pay more attention. I have tried Guidance, but I don't recall any benefit.
Mouseover of the target number does list an additional modifier from Guidance (included in "Roll bonus"). It's just that the modifier (+1 to +4) shown there seems to be a different d4 result than what's used to display the target number. In the screenshot of my original post, the base Difficulty Class is 18, my proficiency is listed as +2 and Roll bonus as +4, which should result in a final target number of 12. You can see that the game claims the target is 14, but at the same time declares my roll of 13 a success. So it seemed to use a target number lower than 14 (very likely the 12 that results in 18 minus 2 minus 4 from the mouseover info).
