It's easier to invent something new than to build an understanding of something already existing.1
Relevant to software development: Naur thinks a new team is better off just writing a new program than trying to make sense of an old one, Kerr thinks NIH is a manifestation2
Valentino Braitenberg, Vehicles: Experiments in Synthetic Psychology (Cambridge, Mass.: MIT Press, 2004).
Jessica Kerr, “The Origins of Opera and the Future of Programming” (Medium, July 8, 2019), https://the-composition.com/the-origins-of-opera-and-the-future-of-programming-bcdaf8fbe960.