At this point, the only reason they have auto crits is to give the illusion of feeling powerful, nothing more. The reason? Simply put, right now WARs meld determination instead of crit/dhit like the other tanks because of this. If auto crits were removed, WARs would start melding crit/dhit again, and thus reduce the utility of battle litany etc as you mentioned already. Either way, it balances out, so its best to keep the auto crits and thus the illusion of power in the hands of casual players, instead of taking something away that would otherwise change very little.