The problem with library Mobi for Kindle users is that all those Kindle users would have to learn to use the necessary non-DRM-breaking scripts to tweak the files just enough so that the Kindle will accept them as readable while still honouring the library expiry dates and so forth.
Given the task of public education at that level and going with the easy, out-of-the-box partial-compatibility-with-selected-ereaders option, if I were a librarian I'd quite cheerfully go add only ADE-ePub/PDFs to the future collection and save myself the hassle.
And I say this as a Kindle owner who regularly uses the e-resources of my local library.
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