I know that whenever I fire at an enemy there is relatively high probability of hitting units in obstructing tiles and some chance to hit just anyone nearby. But without knowing exact probabilities I can’t make an informed decision whether I should proceed with attack. So a shot against any target with an ally nearby devolves from tactics to gambling.
So whenever I target an enemy I’d like to see true probabilities to hit nearby units (after chance to deviate from main target and ranged defenses are taken into account).