it's not on purpose, it's out of necessity. For example, a company has a huge COBOL code base. It plans to migrate to say, python. After 2 years of analysis, an

it's not on purpose, it's out of necessity. For example, a company has a huge COBOL code base. It plans to migrate to say, python. After 2 years of analysis, and some failures, they realize how much their organisation is driven by the software. So they decide to change their business processses. Another two years of analysis. Now they start rewriting again. After one year, they realize the consluting company responsible for the rewrite is screwing them, they stop the effort. New management comes in : "we need to put more resources in marketing, so we put all IT efforts on hold for two years". Now marketing needs data about its customers, so they ask the IT team to build some reports. This implies coding new stuff in COBOL, after 5+ years... That's what I'm in right now :-)