>Make exactly one sale of an app per person, ever, regardless of the number of devices they own, how often the app has been updated since they last used it, and so on. This also teaches customers that they’re entitled to come back to a free app at any point in the future, no matter how long ago they paid for it.

And

>Ideally, make exactly one sale of an app per family. This reinforces the commodification of software; it’s to be shared around.

From a consumer perspective, I whole heartedly agree with author.

I own 3 devices, 1 is android and other 2 are Iphones. I never noticed how damaging this could be for developers to have their work sold for the price of one when most of the people use them on multiple devices.

Update part also makes sense, an application built 3 years ago has come a long way since then and have taken thousands of work hours for maintainance and updates.