On the other hand, taking notes with a lot of equations is cumbersome with a computer, and straightforward with paper and pen. I also can’t do any serious maths without paper, e.g. playing with equations. It flows naturally with pen and paper, it is just horrible with a computer, unless you actually defer the equation solving to the computer using dedicated symbolic math software which is very useful, but that’s not always what you want to do.
Writing on paper does not throw hard to decipher errors though