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It makes sense. It's an efficient use of time.
Ol'ga Kagan put together Golosa, texts for a 1st/2nd year Russian sequence. I watched her and her TAs do it. It took years, starting as the occasional drill in class, then chapters and exercises that were tested on students and rewritten repeatedly for clarity and accuracy, some chucked and replaced. During the early stages, they were adjuncts to a main text. Finally all the bits and pieces were assembled, with a lot of work to bridge between the bits and pieces, to produce a text. TAs went through it and used it selectively, with a main text. It wasn't until the text was in pretty good shape--after another years' work--that it was the main text. Then the entire text was used, and re-arranged and rewritten as larger issues were worked out--part of chap. 3 might work better as a separate chapter later, for example. A final sabbatical gave her time to put the text in good shape for publication. That's a lot of work. And she knew her stuff, and was an excellent teacher. But textbooks have to be tried out, and using home-grown notes as the only text is a recipe for disaster the first few times. (Believe me, I had a class where that was precisely the case.)
I saw Vicky Fromkin complain about her linguistics text. She co-wrote it with Rodman, and it went through 3-4 editions over 20 years. As the field changed--new facts, old material fell into disfavor, new, trendier topics came along--it changed. But the 5th edition came out mid-term when I was her TA, and she was already under pressure to be working on the 6th edition. No longer driven by changes in the field, it was driven by the increased use of used textbooks. She resented it greatly.
My undergrad organic chem text ran to 1300 pages, with nifty drawing and sketches, and separate study guides and exercise/problem book. I can't imagine a new teacher making up something like that. Three guys with differing fields of expertise collaborated to produce and update it regularly, and it was edition 5 or 6. We could cover 20 pages per class, but only because we'd read it ahead of time and could refer to it. No way the instructor could have gone over all that the material without prior preparation, and I wouldn't want to have seen the first pass at the exercises and drawings.
Textbooks are good things. (Then again, I taught a Russ. lit class last summer with no textbooks: I lectured and provided commentary on authors and texts, and provided all the readings via scans on CD--public domain stuff, or scans made at the last minute as I worked out the details of the syllabus. I couldn't find a textbook that was suitable for a 7-week summer course, or a combination of textbooks that would work.)
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