I'm also "just a user", and sure I love more cool "out of the box" features, but honestly, I think this whole matter is being made bigger than it's worth. With typing the tracking info right into the email as suggested by Xavier, and custom order fields, there are at least two practical solutions.
Okay, the availability of custom order fields requires the Business Edition, but that's hardly more than the $100 that iwally got ripped off with instead (sorry for that), and it comes with a ton more stuff - out of the box, indeed.
Keep in mind that it's usually not only the tracking number only you'll want to pass on to the customer, but in many cases it's also a freight forwarder's name (at least for "nameless" manual shipping methods, a web link for tracking, and possibly even the forwarder's contact number. Which is why I dedicated no less than 4 custom fields for it.
Was it complicated to be put in place? Not at all.
Is it many steps to fill in per order/shipment, or more than if it were an "out of the box" feature? Nope.
Does it work? Absolutely yes.