[gfodor]

Re: fungible talent, I disagree, talent is not non-fungible, it's semi-fungible within certain subfields. If you know how to hammer a nail you can apply that to different applications. Beyond that, I'd argue that if you are a smart individual who is generally well educated and adept at learning, your labor is fairly fungible given enough ramp-up time to acquire new skills.

The entire article (and this viewpoint in general) is predicated on the idea that if you are capable enough to learn what is necessary to build and launch a mobile app you are capable enough to solve similar technical problems that apply to what the author considers more worthwhile to society. I don't think this is far fetched.

As far as determining what is worthwhile, I think this is less about what others think and more about what you think about what you are working on and its worth. Just because you have built something doesn't mean you actually have reflected on if it was the best use of your time. It's easy to be drawn in (due to flow, endorphins, cash, etc) and then suddenly you realize you've spent half of your life working on something you're not exactly proud of. It's easy to throw out moral relativism as an excuse to never be able to say something is objectively stupid, but some things are dumber than others, and at the end of the day this is about what you decide to spend your limited time on Earth doing. These little reminders I think provide a good nudge for people to think about what they are working on and consciously decide they want to continue on that path, regardless of what others think.