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It sounds to me like you're more interested in software development than in computer science. These two fields are often confused for each other, but are certainly not the same thing.
Now, I don't see any reason for there to be new editions as often as there are. Many of the textbooks I read in my spare time are actually pretty old, but outside of some of the topics that rely on technology there isn't a whole lot of reason to have new editions. Even something such as numerical analysis (which should probably have a technology based theme for CAS) doesn't really need to be updated very often as the algorithms don't change, just the languages that may be used.
Perhaps I'm just biased, but a well written text book seems much more useful than gleaning bits of information from a variety of sources that all use different notations and symbols for learning about a topic in math.