Many rarely actually work in the real world, and are academics their whole lives. Most haven't worked in 20+ years. While in undergrad, I only had 1 professor who was actively working in computer software in the real world, and he was an adjunct. The rest worked maybe in the 70s and 80s, and became professors. Until I went back to a community college, where the professors are part time, and teach in their evenings after their day jobs did I get multiple professors who were active in the field. (and they tended to be much younger).
As with all classes you take, take what they tell you with a grain of salt and make up your own mind. (Most professors are biased in some way and teach accordingly)
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