War story: we turned off the “print” button on MSN because it was unused. Users in Japan complained - they were printing articles to read on the train. Turned it back on in that geo
Then again most browsers have a print button.
If you want to read the data behind many of the decisions, read these papers [0].
Every time a new rule was added, you had to wait up to 24 hours for the css servers to propagate.
You have to delete something every once in a while to make room for something new.