Very nice article, and makes a lot of sense. I would be interested to see how you apply this to apps that are only used infrequently but very intensely. It would seem that the user would not see the incremental improvements but rather drastic changes on the occasion that they use the application (web or mobile), so in that case do you lose some of the benefit from this strategy? In short, if they are not regular visitors / users then does this 'breadcrumb' method of improvement have as much weight?