The Teamfight Tactics developers made major changes for many of the game's minor flaws. For example, the Gadgeteen trait has been reworked to give these groups a stronger group synergy towards the end of the game. This little tech trait has always been problematic due to its inconsistent compatibility with other Set 8 builds.
What's new about Gadgeteen?
Gadgeteens were mostly about making hand-made weapons. However, they also have bonus buffs, which are based on how many items you've equipped on your Gadgeteen units, during a given period.
A fully itemized unit can get up to 36% bonus damage and damage reduction for each item on the board. Because both Annie and Nunu are tanky champions that can do a lot of damage, you gain an edge in the late game, when the Gadgeteen trait used to sag.
In Teamfight Tactics (TFT), how do you transition between builds?
With the Gadgeteen buff, what can you do to make something?
Nunu may become a deadly, frightening force of damage with these kinds of buffs, as Rabadon's Deathcap. The Gadgeteen trait will buff him out of his health.