They make wireless chargers in a dock form. I love it - same interactivity as a dock but easy to pick up and go.
I second that. I have an Anker charging stand and it works beautifully. As it is a stand, there are no alignment problems, and it is easy to keep using the phone, especially, as face id always triggers when looking at the phone when I get a notification. The charging mat I have requires careful alignment and while lying flat, face id usually does not trigger.
It was simple to put your phone in (as opposed to a cable that might fall off the table or move around), and kept the phone facing you making it easy to interact with while charging (unlike the wireless charger).
But at some point they probably figured out they could save 20 cents by selling it separately.