Yeah and over the course of 2 or 3 decades of development a lot of software has moved through several different version control,ticketing systems and developers.

So you wind up with files stating an author who no longer works there with an email address that the company used 3 acquisitions ago, a ticket number you aren't even sure what system it was for but you just know it isn't being used anymore and source control history that goes back 5 years out of a total 25 years of development.

The entropy is real.