the technologies have overlap in many use cases but are complementary, QR Codes need to be visible and NFC (as the "Near" implies) requires a receiver to be near; you also need to program an RFID chip to do NFC, for QR Codes all you need is a printer or a screen, again very different use cases from the publisher standpoint as well; I guess Google's choice has more to do with what they want Google places to turn in to that with a choice of technology by itself
All very nice but based on my 5 year of project management, I'm fairly confident to say that organizing work like this will only be successful with a lot of luck. Every project or every product that gets developed has a moment where "things go wrong"(tm) and having external constraints (like deadlines, backlogs, ...) reduces the risk of failure ... a lot. I'd only try the approach from the presentation if your team is made up out of very disciplined, skilled people with the full benefits and responsibilities of the outcome.
nice and simple, I suggest you make the difference between the "list adding" and "task adding" contextually clearer, I don't mind registering (it was short enough)