Chalice of Power
It can be said that the update changing from Chalice of Favor to Chalice of Power has almost eliminated this item from Teamfight Tactics, simply because no one uses it anymore due to its weakness. Remember that with components like Tear of the Goddess and Cloak of Agility, we can create many much stronger items compared to Chalice of Power.

Wasting valuable component items like these to create Chalice of Power is not worth it at all. Perhaps Riot Games has gone a bit too far in the recent update, nearly turning this item into “scrap” that no one uses, and they might need to make some light buffs to this item.
Bloodthirster
Many will be surprised, but the truth is that Bloodthirster is gradually being neglected in the physical damage amplification items of Teamfight Tactics. With the game’s nature leaning towards compositions that can deal massive burst damage and quickly eliminate opponents, the additional healing capability is becoming meaningless as your champions don’t even have the chance to survive and heal back.

Therefore, it’s no wonder that gamers are extremely uncomfortable with how Riot Games treats this item. Instead of allowing Bloodthirster to grant shields like in League of Legends, simply buffing its lifesteal stats is utterly meaningless. One reason why Bloodthirster is being neglected, similar to Chalice of Power, is that its component items are too strong and there are many other more valuable items to combine.
Zz’Rot Portal
Ridiculous is the term that best describes this item; it does not provide any notable defensive or offensive effects. Instead, your champion has to die for this item to be effective, while what players are trying to do right now is to keep their units alive for as long as possible. Therefore, no one thinks about combining this item at all.

Furthermore, the effect of Zz’Rot Portal is extremely paradoxical; the Voidling generated from this item will be much stronger when the champion reaches 3 stars. However, when a champion reaches 3 stars, they are supposed to be the carry, and players will want them to survive as long as possible to deal damage, not die and spawn a Voidling. Perhaps Riot Games should reconsider reworking this item.