"Add cancel buttons system wide" is much too large to be considered a paper cut (not a trivially fixable usability bug).
If you really think adding cancel buttons would improve usability, I suggest creating a blueprint, and taking screenshots of all of the dialogs you think would be improved with cancel buttons, and explaining why adding cancel buttons makes each dialog more usable.
"Add cancel buttons system wide" is much too large to be considered a paper cut (not a trivially fixable usability bug).
If you really think adding cancel buttons would improve usability, I suggest creating a blueprint, and taking screenshots of all of the dialogs you think would be improved with cancel buttons, and explaining why adding cancel buttons makes each dialog more usable.