It leads to a lot of old software which is not going to be upgraded ever. Then the entire project dies and gets rewritten from the scratch, because nobody wants

It leads to a lot of old software which is not going to be upgraded ever. Then the entire project dies and gets rewritten from the scratch, because nobody wants to work with Windows 2003 server running Delphi 7, Java 1.4 and Oracle 9i in 2020 (personal experience). Old software is not necessarily broken, but it is always a tech debt. And you can't live in debt forever, our IT does not work this way.