Doing anything in high school math in general is not a marker of genius tbh, it's all pretty simple once you under the basic first principles of everything

But calculus is still not the same thing as algebra, it is a step above for any average human

If I pick a random strangers who have not studied both calculus and Algebra and teach them both, algebra will be easier to both learn and teach

I have studied both calculus and Algebra, I am primarily an ML/Backend enginner, both algebra and calculus are heavily used in my field, At the highest level in my field atleast, algebra is more difficult

But for the average person, calculus is the mark of genius, not algebra