What does it mean for something to be broken from first principles? I would expect some that just cannot work on a fundamental level, like faster-than-light tra

What does it mean for something to be broken from first principles? I would expect some that just cannot work on a fundamental level, like faster-than-light travel or a lightbulb that powers it’s own via solar panel. 3% vs 7% doesn’t seem broken on principle, just, a tuning parameter is off.