I also should have been clearer, there are other options. The Brits like this idea of HESH. This works against both tank armor (though less than APFSDS rounds) and fortifications alike. This way the tanks can carry just one type of armor instead o f having to manage a mix. HESH has persisted because the Brits like rifled barrels, and doing a sabot round with a rifled barrel has proven quite difficult.