Why don't apps have a “show author mode” that shows who wrote a feature?
For example, if you activate this mode in a word processor and then export a document to pdf, then you will see all the people who contributed to the export to pdf code.
For one thing it would be a 'cross cutting concern' or 'dependency injection' which is the kind of thing programmers hate adding to their apps. Also how exactly would you envision 'you will see all the people' to work? Where will the list be shown, for how long?
It doesn't seem to solve a customer want. Why would someone who made a word doc want that? Atm you can write it in the word doc and you would have full control of the list that way too.
Additionally, there are far better tools available such as tracking changes/redlining that show specific changes that each author has done.
See open source git repo...