A few reasons: 1) Every developer no matter how new wants to contribute something. 2) There is no centralized authority in most languages/package system to st

A few reasons: 1) Every developer no matter how new wants to contribute something. 2) There is no centralized authority in most languages/package system to stop them doing so 3) Imagine all the bad code you write in the first 2 years but now you can't delete it because 100 other developers rely on it and 100 other developers rely on them The rube goldberg machine exists because of the matryoshka dolls that is the dependency tree. Sometimes rewriting things is actually easier than trying to untangle the wire of dependencies.