It certainly does.
Someone bought Delia Smith's Complete Cookery Course as a wedding present for me and my wife. We were already reasonably proficient in the kitchen, but this book goes from the basics of boiling an egg, cooking perfectly fluffy rice onto more complex recipes. We've bought it for newlyweds since.
Would be useful for any home cook (I have it in my kitchen)
https://www.amazon.com/Professional-Chef-Culinary-Institute-...
Time to watch Cunningham's Law in action.
I agree with your basic point though. And there are tons of cookbooks today that do spend pages on relevant techniques--though certainly some are celebrity chef memoirs interspersed with recipes and high-quality photoss.
Table of Contents: Acknowledgments. Introduction. Meal planning (45pa). Food shopping (12pa). Cooking (530pa): measurements, beverages, breads, cake, candy, cereals, cheese, cookies, desserts, eggs, fish, meat, meat sundries, pastry and pies, poultry, preserving and canning, salads, sandwiches, sauces, soup, vegetables. Deep fat frying, leftovers, misc.
The Key To Good Cooking on the other hand is a much better book for home cooks and focuses entirely on practical ingredients and techniques and is organised in a way that makes it much easier to find exactly the advice you need as you need it.
'Never used' as I get a lot of pleasure tasting and trying myself, picking up tips via browsing bookstores in the past and YouTube or talking to chefs now.
https://www.amazon.com/Cordon-Bleu-Complete-Cooking-Techniqu...