If a person has control over any function, it can also be used to control the computer
A good example would be xkcd comic number 1172. https://xkcd.com/1172/ It depicts a user named LongtimeUser4 whose workflow was disrupted after a bug was patched in an unidentified software version 10.17. This bug caused the CPU to overheat and when the spacebar was held down, this temperature rise would work as a control key in emacs. The user wanted it brought back or added as an option, because it had broken his workflow. The moral of the comic is that "every change breaks someones workflow", but from our point of view it is: if a person has control over a function, then that function can be used to control the computer.