> it's not useless, they just found success in a career that didn't need it. Or don't realize how often they actually do use the skills they learned in calculu

> it's not useless, they just found success in a career that didn't need it. Or don't realize how often they actually do use the skills they learned in calculus class to solve problems that don't necessarily involve derivatives or integrals but do require a methodical, structured approach to solve that isn't something you're born being able to do but must instead be honed through practice on "toy" problems.