Broading Tyco's point, XP management is generally lacking. I don't like how fast you can outscale the content in EA and I m frankling concerned about how larian would handle the difficulty. (Nowadays difficulty is very low in video games beside a few exception)
So yes a diplomatic solution should grant a reward (XP, inspiration or long term gain), but more importantly XP from kills should imo be capped somehow (max level per zone?)