https://en.wikipedia.org/wiki/Second-system_effect https://en.wikipedia.org/wiki/Second-system_effect A system that old that has been working for as long will

https://en.wikipedia.org/wiki/Second-system_effect https://en.wikipedia.org/wiki/Second-system_effect A system that old that has been working for as long will surely have so many quirks, exceptions, bugs and workarounds deeply engrained in its users' processes. A naive port and rewrite will probably need many man-months of lost productivity spent recreating all the quirks of the original piece of software, resulting in an even less maintainable second iteration.