People lower on this trait tend to register stress, uncertainty, and interpersonal tension sooner or more intensely. A hard week may continue to occupy the mind after the immediate problem is over. This can be painful, but it can also provide early information: you may notice a broken promise, an unsafe dynamic, or a growing mismatch before someone who feels less affected does. Sensitivity becomes most useful when it is paired with ways to recover and decide what action is actually needed.
The cost is that an emotional alarm can make a manageable problem feel like a complete verdict. Worry may narrow attention toward threats, and other people may mistake your strong reaction for exaggeration or instability when you are responding to details they barely noticed. It describes what you tend to feel, not a condition or a measure of your ability to cope.