Luck is often part of "enough information", which we don't include, sometimes we don't want to include, and sometimes we can't include at all. For this seemingly unexpected event, some people can solve it by their own hard power, while others can't; Some people are suddenly affected, while others are smooth and undisturbed.
For the situation that "some people can handle it and some people can't", we say that this should be counted as part of strength, but it is not. For example, A has six skills of ABCDEF and B has four skills of AXVB. The competition between Party A and Party B mainly needs A's skills and B's assistance. As a result, an unpredictable event of human intelligence gathering occurred and X was needed to deal with it. As a result, Party B happened to know X, and Party A failed. Obviously, Party A has more things to deal with than Party B, but emergencies are beyond its ability. Can it be said that Party A is weaker than Party B? What if the emergency that day was CDEF?
So strength is actually a historical word, which can only represent a person's historical achievements. If a person always achieves nothing because of bad luck, it can only be said that he has various abilities (abilities are also historical words). These abilities can reflect some small achievements in a relatively small scope, but there are no big achievements, which also means that they may not be comprehensive enough or not adapt to the requirements of this era.