We do not have infinite agency.

Our surrounding context constrains our possibility space.

That context is a complex emergent cacophony of physical processes, but most importantly the decisions of everyone else we interact (directly or indirectly) with.

You can only hold the idea "every decision I might make is equally good" if you don't interact with the rest of the world.

When things interact with the real world, they need to be ground-truthed: shown to be compatible with the world as it exists.

Interactions with other people open up the possibility space (you can do more together than what you could do individually), while limiting your agency within it (requiring you to cooperate).

Choosing to cooperate or interoperate with others means harnessing the power of the whole at the expense of your local power to choose implementation details.

Arendt defines agency as ~"non-undoable action taken within a community of other individuals"

We are all embedded in a fabric of interdependence way larger than we can comprehend.