I knew what I was getting into 21 years ago. I do not know if it has changed much. But...
Most of the things you'll learn are not practical, but they are not wrong. Most of the things you'll learn are old, but they are not outdated.
CS is a young field, it's not even 100 years old. But a lot of "modern" things have a really long history. Take for example Object Oriented Programming. That didn't start in the mid 1980s. It started in 1950s. It took 40 years before the concept was worked out enough to become properly usable (in the 1990s).
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I knew what I was getting into 21 years ago. I do not know if it has changed much. But...
Most of the things you'll learn are not practical, but they are not wrong. Most of the things you'll learn are old, but they are not outdated.
CS is a young field, it's not even 100 years old. But a lot of "modern" things have a really long history. Take for example Object Oriented Programming. That didn't start in the mid 1980s. It started in 1950s. It took 40 years before the concept was worked out enough to become properly usable (in the 1990s).