Yagni originally is an acronym that stands for "You Aren't Gonna Need It". It is a mantra from Extreme Programming that's often used generally in agile software teams. It's a statement that some capability we presume our software needs in the future should not be built now because "you aren't gonna need it".
On the surface, the world of agile software development is bright, since it is now mainstream. But the reality is troubling, because much of what is done is faux-agile, disregarding agile's values and principles. The three main challenges we should focus on are: fighting the Agile Industrial Complex and its habit of imposing process upon teams, raising the importance of technical excellence, and organizing our teams around products (rather than projects).
The central goal of Slow Productivity is to keep an individual worker’s volume at a sustainable level. A natural fear is that by reducing the amount of work each employee tackles at any given time, it might reduce the total amount of work an organization is able to complete, making it less competitive. This fear is unfounded. As argued, when an individual’s work volume increases, so does the accompanying overhead and stress, reducing both the time remaining to actually execute the tasks and the quality of the results. If you instead enable the individual to work more sequentially, focussing on a small number of things at a time, waiting until she is done before bringing on new obligations, the rate at which she completes tasks might actually increase.