for top kd's, yes this is true
but if can get a ghetto to make 5-6 hits on one prov whilst his army is out, taking ~10% of his land each time in war, this can drop them to ~60-55% of their original land
and in ghetto's who make ~50 hits in a min time war, often there will be 5-6 people who's activity is the best in the ghetto, so if you can take even 3 of them to ~50% of their starting acres, it can make a massive difference in the war effort =)