It's only mentioned in a single line, but there are a lot of real bugs in legacy code that the users actually learned to live with. It's the software's personal

It's only mentioned in a single line, but there are a lot of real bugs in legacy code that the users actually learned to live with. It's the software's personality now. And when someone has learned to live with a bug, it will be missed if it is suddenly not there any more. In the past I considered that a bug in human behaviour, but actually it is admirable. You give people a broken tool, but instead of failing, they find a way to succeed using that broken tool. And of course after the effort they are not as willing to change to anything else. Don't change a running system and such.