That makes two of us!
When I got my first Android phone in 2010 or whatever, I skipped setting up a phone book because I wanted a secure solution for syncing contacts instead of uploading plaintext names to Google (how quaint of a threat model). I still haven't gotten around to it. The biggest inconvenience is when I want to text/call someone I haven't spoken two in a year or two, don't know their exact number, and I've got to scroll way down the list until I see it.
Then there are the funny coincidences like my usual Fedex Freight guy's phone number is one digit off from a friend's. That one really threw me the first time.