There's also a pretty large self-selection bias. So, sure, there's maybe missed opportunities to practice during a CS curriculum, but there still are plenty of

There's also a pretty large self-selection bias. So, sure, there's maybe missed opportunities to practice during a CS curriculum, but there still are plenty of them (remember, 2 years of 'core' classes, that have nothing to do with CS, not to mention opportunities to talk to the professor and TAs for questions, grade corrections, and just straight up brown nosing, and that's ignoring all the group projects you're likely to have, just for the fact those invariably turn into one or two people doing the actual work, and of course it's also ignoring any other social interaction opportunities you might have on a college campus, which they're kinda known for). You just have plenty of people who -want- to be heads down over a computer going into CS; you generally don't go into nursing or psychology or similar if you're not looking to work with people.