This piece of advice does not apply to legacy systems. There is a lot of stuff in there that nobody knows how it works or why it is in there, yet attempting to

This piece of advice does not apply to legacy systems. There is a lot of stuff in there that nobody knows how it works or why it is in there, yet attempting to throw it out has led to so many disasters in the past that no one dares to even think about removing it. Of course there is no budget or political will to investigate - money comes in just fine even with the onion in the varnish.