Other countries do a lot of "pre-algebra" in the later grades of primary education, when the kids are quite ready for it; "drill and kill" rote methods are generally focused on in very early grades, since they help build familiarity with the sort of rigorous, algorithmic thinking that's required for good math proficiency. This is what Russian Math, French Math, Singapore Math, etc. are built on, and the approach has stood the test of time indeed. The fuzzy "Common Core" approach pushes abstract content way too early, and ends up confusing kids as a result.