Parley's main issue is how much time it takes to do. I don't think anyone would have an issue with it if you could get what you need in, say, a minute. Then it'd just be a nice little variety and a break from combat. As it is though, you spend a second or two picking your tile, then a minute watching the whole board shuffle itself up, the NPC to select their tile, then the board to shuffle up again... 90% of parley is spent waiting. If they drastically sped the game up, it'd be fine.