Evey time a shot if fired by your troops or against your troops it is decide by RNG you have no control over. Critical is simply an added effect.
You do have control over that, it's based on distance, cover, and type of troop. If the game could be balanced without Accuracy being a factor, I would advocate for that being removed as well, but it's not a realistic thing to expect.
Random gun criticals are not comparable.
If accuracy were removed right now, the game would become unplayably unbalanced. If main gun criticals were removed, the game balance would not change, it would merely remove frustration. They're gone in tournament mode for a reason.