I can, but I won't build in the hot new thing for the sake of the hot new thing alone. What that tends to mean is that when I'm looking for a new job, my skill

I can, but I won't build in the hot new thing for the sake of the hot new thing alone. What that tends to mean is that when I'm looking for a new job, my skills at old company are in old thing, while everyone is excited about hot new thing. This is typically most obvious with javascript libraries.