There is one problem that I have not seen mentioned. Statistics might be much more useful but except for the first chapter (discrete probability) they are much harder. As someone who wanted to work in data I have tried hard to understand probability distributions, I have watched 10s of videos by different professors, done exercises and sure I was able to pass but the truth is I never really understood it. The intuition behing statistics is non trivial. Sampling is very hard to understand. Even on HN during COVID there were mathematically literate people trying to make some back of the enveloppe probability calculation and all they were able to do was show their misunderstanding of how statistics work (to be fair I would not have been able to do the task myself but I could feel something in their reasoning was wrong).