When you assign a different ICC profile to an RGB file than how the pixels were created you change its appearance. If your intent is to change the appearance of every file in your workflow, I would not recommend this as a best practice. If your books are published electronically Choose how you want your work to appear, but understand that if all of your files come in as sRGB then you will not be able to expand their gamut again after it was reduced to fit within sRGB. Unless you do a lot of work on each file after assigning the incorrect ICC profile. Your company may also not be paid extra for this color-correcting work. So that's a business risk. Regardless of the fact, that there are a million large gamut displays and also very many print processes that are larger in some areas than sRGB, if all you receive is sRGB images, use that, or start requesting Adobe 1998 files and begin a transition that will most likely be a good future move for your company.
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