The Number One Problem With Changing Your Interfaces Once They're Out in the Wild

The best rule of thumb is if you've already made that interface uh available unless you have it in your power to go back and refactor every use of that interface then if you need to modify it you should just create a new interface. The whole point of the interface anyways was to basically let other people use it I mean what if Microsoft decided to change some of that what would everybody end up doing you your code would be bonkYou'd have to start over. If you go changing that you break everybody's stuff nobody will ever use your interfaces again right?