Or actually beneficial? for someone learning to code

I'm starting to think it's a meme because come on, at what point would you decide "hey it's better to work through a thick ass math book instead of doing actual coding projects"? Probably never

Maybe if I could believe math is good cross training for people who will basically do disguised math as a job (physicists, theorists in science/stats/econ/etc) but for 99.9% of professionals who do a job that only requires an undergrad degree your concerns are more applied and business oriented, that goes for developers and stats guys and financial analysts and so on