I'm not sure whether current telemetry tracks how often each button in the share menu is used, but I suspect fewer people print or save as PDF from their phones than send pages to their desktops. I personally send pages to my devices every day, and it's inconvenient to stretch my right thumb so far to reach that option on large phones.
Suggestion: make the share-menu buttons rearrangeable, or at least move the "Send to device" option to a more thumb-friendly position for one-handed use on large phones.