Overwatch’s lore is delivered almost entirely outside the game: animated shorts, comics, and the story mode that came with Overwatch 2. The in-game experience contains almost no direct lore. Bastion — the Omnic combat unit — has a backstory accessible only through a standalone animated short that was not a launch product.
The short reveals that Bastion’s cartridge — the memory unit that survived the Omnic Crisis — contains recordings of Bastion’s last active sequence before being shut down. In the short, Bastion encounters a forest and birds, and its combat programming conflicts with its environmental observation data in a way that produces something resembling curiosity.
What the short deliberately withholds: whether Bastion’s current passive state represents genuine change or simply dormancy. The cartridge contains violence. The bird is not afraid. The game allows both readings.
Blizzard placed this ambiguity at the centre of their most mechanically dissonant hero: Bastion in Overwatch is extremely powerful and very easy to play, which means most opponents encounter him as an obstruction rather than a character. The lore and the gameplay deliberately pull in opposite directions.

Saved this article for my gaming reference folder. Essential reading for anyone serious about this game.
This is exactly why I love this game. So many layers underneath the surface if you just take the time to look.