That struck me as odd too. I never pick up my phone when I have my computer in front of me. Everything my phone does, my computer can do better, including taking and making calls and texts via google voice.
Take Facebook as an example. Your phone will ding on FB updates or incoming messages on Messenger, even when the phone isn't actively being used. On a computer you need to have a browser open and have Facebook opened in a tab for it to give you any notifications.
So it's easier to avoid on your desktop than on your phone.