One reason may be that mechanical engineering degrees really only mean something when they come from accredited universities, if you want to go for your FE or P

One reason may be that mechanical engineering degrees really only mean something when they come from accredited universities, if you want to go for your FE or PE licenses in the USA you'll need to have a degree from an accredited university. Most places that consider you for a job as a mechanical, electrical, civil, aeronautical/aerospace, etc engineer only want to see you with a degree that's accredited. The CS job market has always been more accepting to self taught, hence courses to self teach. I say these things working in software development with a bachelor's and master's in mechanical engineering. Good friends with someone with a bachelor's and master's in electrical engineering working in software and brother-in-law to someone with an aerospace degree.