The counters to the Beast Team have been weakened
Essentially, the Beast Team is a composition that requires time to scale up in strength. This team needs to accumulate a lot of Glory points to gain an advantage in health during the late game. Therefore, compositions that can burst down opponents quickly will be a significant counter to the Beast Team.

Before patch 13.9b, Duelist and Gnar – The Prodigy were such compositions. They could deal explosive damage and cause the Beast Team to gain very few stacks whenever they faced off. Fortunately, in patch 13.9b, both Duelist and Gnar – The Prodigy were weakened, allowing the Beast Team to make a comeback.
Flexibility is the key to victory
After many patches, the Hero Augments are showing a huge impact on how compositions are built in Teamfight Tactics. Many compositions require certain Hero Augments to operate effectively. Without these important upgrades, the strength of the composition will be severely diminished.

For the Beast Team, this composition does not fall into the aforementioned situation. The reason is that many champions in the Beast Team, with different price levels, can all become primary damage dealers. Therefore, regardless of whether Hero Augments appear at the start, middle, or end of the game, the Beast Team always has strong options to utilize.

This is a factor that is highly appreciated by Teamfight Tactics masters. Of course, this flexibility comes at the cost of players not necessarily achieving a top 1 position. However, with a long-term ranking climb, this factor will help players earn points consistently.
Conclusion
With the counters being weakened and the flexibility in gameplay, the Beast Team is currently a very effective option for ranking up. Teamfight Tactics players should take advantage of this composition to quickly reach their desired rank.