@"Legacy code" is often code that you want to replace because you don't understand it. The problem is, before you can replace it, you need to understand it, and, once you understand it, replacing it is rarely the cheapest option any more.
Nicole ParsonsOn occasion, you open up legacy code and discover the backdoor that an overseas contractor buried in some obscure corner.
Foiling a hack, ransomware, & a lawsuit settlement rarely gets the public acknowledgement that it should.
Most senior managers slap an NDA on it and memory hole it as quickly as possible.
Then stick you with the task of shadowing all code commits as punishment. Lol.