Google is your friend, web activity = app downloads, online shopping, web-browsing.
Last time I checked, google's flagship phone doesnt have a memory-card slot, I dont see you b***hing about it?
and no, most apps these days automatically sync with dropbox, so I dont see how SD cards are more convenient.
Google's flagship phone does not sell that well. It has very low market share. Most Android buyers buy Samsung phones and those do have memory cards. Most people these days do not use drop box, so having apps automatically sync with dropbox is irrelevant.