It all about cost effectiveness , sabot is a faster round ,it also has a better ability to stop anti ship missile since most of them has a harder shell to penetrate ships , so proximity round aren't enough.
It worth the money if it can defeat the missile and save the ship , replacing the ship and it's crew are just so much more expensive then saving a buck on the ammo.
Russian's don't use sabot cause the don't have the budget , and also their accuracy for terminal defense is not high enough so they went with higher fire rate to raise the chance of impact ,note that the Russian one is 10K rpm while the rest is 5K rpm-ish
View attachment 88105