In another thread we discussed the possibility of symmetry in NPC-to-PC social interactions. Symmetry in that context, means that a PC or NPC can make an ability check to influence a PC or NPC. That debate was highly legalistic. However, there were a few cases where disagreements seemed much less vehement. I am curious about those cases, because they may reveal an opportunity to enhance immersion-in-world through improved (but by no means complete) symmetry between player-characters and other characters.
Disregarding RAW and RAI completely for the purposes of this thread, how do you run NPC-to-PC social interactions in respect of just the cases presented in this poll? As you can see, I am hoping we can reveal our "normal" in these cases. Just to set aside fears, there is no slippery-slope entertained here: the cases are as you see them, and any commitments in their regard are not assumed to be commitments to anything further. This is all for 5th edition, in case of doubt.