Why can't League of Legends LPL all-China class always win the S championship?

The performance of LPL All-China Class in S-Games has been unsatisfactory. In the past few years, RNG, EDG, WE, IG and other teams have all participated in the S-match, but they have never won the championship. Among them, RNG and EDG both entered the finals, but both lost to South Korea. IG and we also entered the quarter-finals, but both were eliminated.

At present, all China classes of LPL include FPX, TES, JDG, BLG and WBG. These teams are very strong, but they haven't won the S-class championship yet. However, their performance is still worth looking forward to. For example, this year's world champion JDG is all-China class.