Neither apple nor pearson could figure out how to put some pdf books onto an ipad.
They should have gone with Androids or Chromebook. iPads are a major pain in the butt. No folders, no coherent file/folder systems, no external storage, inability to sideload custom apps, and unnecessarily expensive in comparison.
Taking you as if you were seriously making a point. Apple has iBooks which display PDF books natively. . . and Apple uses Display PDF for their screens. So sorry BZZZZT. Wrong. In addition, Apple iPads pioneered e-text books for college level textbooks. . . and many Universities and Colleges issue their students an iPad to supply all their text books, college documents, access college emails, bulletin boards, and to take tests.