I have also thought about this again. The best thing would be to completely abolish the automatic dialog trigger. Let's just trigger the dialog ourselves, like in the good old games, by addressing the corresponding NPC ourselves. Then you can at least save wisely before the dialogs instead of positioning ranged fighters in melee or accidentally killing Ethel with a crit and not getting the dialog at all etc. pp. A simple, tried and true, and much less annoying solution.
As far as the answer selection is concerned, I agree with the previous speakers.