Is YAGNI (You aren’t gonna need it) Still Relevant in Backend Engineering System Design?

YAGNI stands for You aren’t gonna need it and its a pillar in extreme programming, in this video I discuss this philosophy within the context of Backend Engineering.  https://en.wikipedia.org/wiki/You_aren%27t_gonna_need_it  * Extreme Programming Rob Jefferies * You Aren’t Gonna Need it  .. true but only if the design is well defined  * But I am going to need it * Waterfall vs Agile