> CS graduates going into other fields [like finance]
Finance is just like every other high-professional industry, they train you for what you need to know because they are invested in your success. I worked in that industry for 6 years. Most banks run a 2-3 month internal bootcamp for fresh college hires. I was a math/econ double major and sat next to an english lit major in my class. My brother was a poli-sci major and went straight from college -> bootcamp -> Goldman Sachs as a developer.
I think people greatly overestimate the value of their major (excluding those going into academics). My personal experience in finance and tech is that Finance and CS majors are the absolute worst about overvaluing their education. 2 years of work experience^ erases any "superiority" of an industry-specific major compared to an art history major (all else equal).
^ I've done a fair amount of mid-level hiring. I've told people in the past that mentioning your major in an interview after 2 years of work experience is a strong strike #1 to me. If your major is still relevant to your ability to do a job, I generally assume your recent work experience has been worthless.