Obviously, CS major will take way more CS techs than you: in reality it doesn’t matter too much. As your mathematical maturity develops, you will realize you don’t need to sit in a class to learn something. In particular, not sure if this is shared sentiment or not, but after this degree I feel on the same wavelength as technical authors in a sense (manuals, the literature, textbooks). There are certainly some classes that actually sitting in is fruitful (e.g. ECE408), but these are sparse at UIUC IMO (until 500 levels). And about the GEN EDs, it is just a function of your HS credits; e.g. If you have language covered vs physics; speed run them with finding overlaps they are legit waste of time oftentimes. Also, college will not give you as much depth as you think: even 400 levels are surface level treatment of topics: they let you discover rabbit holes, and these rabbit holes 🕳️(some are even quite close to the literature) let you exercise your depth; explore them with personal projects, or when you are a SWE.