In recent days, Duelist has proven to be an extremely hot composition in the Teamfight Tactics Chinese server. Specifically, there are currently 3 different Duelist compositions rated in tier S (very strong). With a series of favorable changes from Riot Games recently, this is quite understandable.
The Disappearance of the Hacker
With the current Duelist system, there are only a few ranged carry champions such as Vayne, Kayle, and Twisted Fate. These champions are quite low in health and lack self-protection abilities. Therefore, when facing strong Hacker compositions, they can be taken down quickly.

The good news is that in patch 13.8, Riot Games has heavily nerfed the Hacker system. As a result, compositions that struggled against Hackers (including Duelist) have become significantly stronger. This creates a perfect condition for Vayne or Twisted Fate to deal damage comfortably.
Allowing Players More Choices for Hero Augments
A notable advantage of Duelist is that this system has champions spread across the price range of 1-4 gold. Therefore, in every match, players can choose their preferred Hero Augment for the Duelist composition. Moreover, the Hero Augments for Duelist champions are generally stable to very strong, adding significant value to the composition.

Flexibility in Choosing Carries
Perhaps the biggest strength of Duelist is that most champions from this system can become strong carries. Even at this moment, the Yasuo carry playstyle is proving to be very powerful with the combination of the Guardian’s Gauntlet and Bloodthirster. Fiora has also become much stronger thanks to the new Hero Augment.

Meanwhile, familiar carries like Vayne and Twisted Fate still have a great ability to carry the team. As a result, opponents can hardly “read” Duelist players when they have too many options for carry choices and good items.
Conclusion
The flexibility in gameplay combined with the nerf of the Hacker has made Duelist extremely strong at this moment. Perhaps Teamfight Tactics players should trust this system if they want to climb ranks effectively in the current patch 13.8.