Some of the problem stems from tradition. The people drawn to publishing as a professional are, by and large, book lovers, and as such, often as attached to books’ physicality as to their text. More is paranoia: unlike music, whose digital age developed largely in response to an already thriving pirate industry, book publishing has held back, waiting for reliable DRM that seems unlikely to materialize.
On some levels, their reluctance is pragmatic. The technology of digital publishing is awkward and inconsistent. The closest thing to a single file standard, e-pub, is still far from platform-agnostic and notorious for destroying formatting elements, which limits what writers and designers can do structurally if they’re planning for digital.
Full piece here.