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My notebooks have internal links for navigation. Every page besides the cover has a right side 'tab' list linking to the 'Overview' page and the eight 'Table of Contents' pages. Meaning every page is linked and easily accessible in a maximum of 2 clicks.
With digital books the pages can easily be made colored with no extra cost (unlike printing books where color pages are more expensive).
White pages of digital notebooks, just as webpages or apps, can be tiring for your eyes. Of course, you can still control your device's brightness to reduce this issue, but many still prefer "dark mode" options in browsers or apps, so I have a white-free option for my digital notebooks.