Here is another thought: when one is an undergraduate or a beginning graduate student, one usually doesn't yet have a picture of the world and as a result, one is able to learn any theory, no questions asked. Especially when it comes to preparing for an exam. This precious little time should be used to one's advantage. This is an opportunity to learn several languages (or points of view), which can be very helpful whatever one does in the future.
I agree that sometimes authors present a concept simply because it's a standard example in the subject, but then spend a single page on it and just move on to other things. One example that comes to mind is a particular text on undergraduate real analysis which introduced Fourier Series in a few pages and then had a single sloppy exercise related to applications to PDEs. I'm not saying the book should have dedicated a chapter to PDEs, but one ugly exercise seems like a travesty and makes you scratch your head about why you're wasting your time on this stuff. I don't expect incredibly motivated concepts in graduate texts on the same subject simply because by then I should have already been motivated enough to study onwards.
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Lian, Ying and Uzzaman, Md Asraf and Lim, James B.P. and Abdelal, Gasser and Nash, David and Young, Ben (2016)Effect of web holes on web crippling strength of cold-formed steel channel sections under end-one-flange loading condition - Part I: Tests and finite element analysis. Thin-Walled Structures, 107. pp. 443-452. ISSN 0263-8231
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