It’s funny because I actually think learning math the old fashioned way is super important. I used to struggle with math a lot as I’d always had calculators. I went back as an adult and got some old 1980s math textbooks based on Soviet pedagogy (widely considered the best for math at the time) and the impact has been huge. I’ve been building from the ground up math skills that got entirely skipped in school, and feel much better about it now. Calculators are useful but when LEARNING math they should not be used imo. Except maybe to check an answer after you already get it. Doing difficult things is good.