How did we solve this when calculators came along and ruined peoples ability to do mental arithmetic and use slide rulers?
Point being, the fundamentals matter. I can't do mental arithmetic very well these days because it's been years since I've practiced, but I know how it works in the first place and can do it if need be. How is a kid learning geometry or calculus supposed to get by and learn to spot the patterns that make sense and the ones that don't without first knowing the fundamentals underlaying the more complex concepts?